Great information, but modern, good NiMh cells do not have the memory effect, and also do not self-discharge like obsolete chemistries. Panasonic's standard Eneloops are rated(and independently tested) for 70% after 10 years.
It's true that a modern eneloop battery is much better than older ones, but it's still an NiMH battery, and the memory effect is simply one of the properties of such a battery. It can be pretty small because of clever technology, but it will always be there. On top of that, we're now reaching the limits of what we can do with NiMH, this is about the best we can squeeze out of it, whereas a lot of improvements can still be made on the Li-ion and Li-poly side.
Thanks for the video!! very useful info, nice voice and THANKS a TON for not putting an irritating high-volume music in the background !!! you deserve a tripple LIKE for that ;-)
NiCd has memory effect. NiMH has a voltage depression. It's harder to give NiMH a voltage depression than to give NiCD memory effect, and unlike a memory effect, a voltage depression is easily reversed. Just drain and recharge once or twice and it's gone. NiMH does not suffer a memory effect, you are correct.
AKIO TV: "The Lithium-Ion battery is the winner. It's probably the best type of battery out there." Lithium-Polymer battery: I'm gonna end this man's whole career.
Lithium polymer is just a polymer pouch version of Lithium ion. Lithium is an umbrella term and has dozens of sub-types. I assume LiPO cells are ale to deliver high current because they are probably NMC type cells (Lithium Nickel Manganese Cobalt Oxide) which have lower energy density but higher power output rate than LCO (Lithium cobalt oxide). LiPO also are more likely to have a tab-less design than the cylindrical can cells like 18650. You're literally saying that Lithium ion in a pouch format has better characteristics than Lithium ion in can for does... I mean I see why you'd say that but it's just not true. Take a LiPO from a laptop and a 18650 cell from a laptop... they'll be VERY close. The only two advantages LiPO Lithium ion has over the can style lithium ion is they are easier to make tabless and the polymer pouch is lighter than a steel can. However, with the advent of tabless can cells, this advantage is nullified, so the only difference is their polymer pouches are light and can take a variety of shapes which makes some devices easier to design. However, Steel cans are sturdy and don't run the risk of delaminating and puffing up like Lipo style cells can, so again they have their own advantages... spot welded metal strips allow for fast connections that are physically strong between physically sturdy steel canister cells, Lipo needs a shell to be safe, that shell can be in the device or around the battery. However, chemically and electrically, lipo is Lithium Ion every bit as much as 18650 canister cells are. Make them the same and they'll perform identically.
Modern, Japanese made, low self discharge NiMH cells last years on the shelf or in low drain devices and they don't really have memory effects anymore. The minimal voltage depression that NiMH can sometimes get when repeatedly partially discharged is easily reversed. NiCd is the one which suffered memory effects. I have NiMH cells that have had partial discharges repeatedly and in the worst possible ways... no memory effect, not even a little. Modern NiMH batteries are really tough and rugged, they can be recharged many many times more than lithium ion can... and they are almost always a standard AA cell these days as we don't really bundle proprietary NiMH batteries with devices anymore... that is what they do with Lithium ion instead. So NiMH can be switched out for a fresh set when dead which makes recharging a non-issue as you can just have enough cells recharging that a new set is ready to go when the last one is dead, and modern smart chargers can recharge them fairly fast while still being safe and providing long life. Now these all depend on which type of Lithium ion you reference, see the cellphone battery and a tool battery are not just different in size and capacity, their internal structure and chemistry are different. Tool batteries and most EV batteries are NMC type Lithium ion (Lithium nickel Manganese Cobalt Oxide), a phone battery is usually LCO (Lithium Cobalt Oxide), and there are also weird ones like LFP (Lithium Iron Phosphate, LiFePO4). Lithium Cobalt Oxide LCO that is in a phone or laptop is the highest energy density Lithium ion variant and is also the most volatile and unstable chemistry, more likely to explode if mishandled and also the least long lived... some are rated to only a few hundred charge cycles, if even that and I've seen them die after only 100 cycles if used by people who are careless or leave their device fully dead or fully charged all the time. NMC lithium manganese cobalt oxide are used in tools because they are more stable, less likely to explode and vent massive flames if mishandled, and have higher output power and longer cycle life than LCO types... downside is they have lower energy density. Then there are weird variants like LFP (LiFePO4) and LTO (Lithium Titanite), LiFePO4 is known for getting absolutely stupid cycle life (sometimes beating NiMH which is impressive) and their extreme stability when mishandled... often being almost as forgiving as NiMH... however their energy density is very low, almost as low as NiMH... seeing a pattern yet? And LTO are very interesting because they are stable and safeish, not quite as long lived as LiFePO4, not even close, usually about half the cycle life, but they have a peculiar ability to safely recharge from 0% to 90% in like 10-20 mins... safely. However, their energy density is low, like as low as LiFePO4 and NiMH. NiMH is LONG lived, modern Japanese manufactured cells can hold a charge on the shelf for more than 10 years (sometimes longer than alkaline cells), they can withstand 100's of charge cycles if handled correctly, I have old cells made 20 years ago that have probably around 1500 cycles before they were rated to go that long, they were used and abused in extreme cold and extreme heat (think used and charged harshly in both -40C and +55C temperatures... like very hot and very cold)... they still hold 100% of their rated capacity but their current delivery has fallen a bit... they're still about as powerful as a 75% charged alkaline cell their size though... but when new, a modern NiMH can deliver easily 4X the current of a similar sized alkaline cell without breaking a sweat. They're usually not quite as powerful as NMC cells or LTO cells but they are still very powerful for their size. Trouble with saying anything about Lithium ion cells is that there are so many different types of Lithium ion cell that it just doesn't apply to all of them. LCO cells aren't all that powerful but have slightly higher energy per unit weight so are used in low power devices like phones that need more talk time minutes to sell them... and the short lifespan means you'll want a new phone every year or 2 which is great for the phone makers. NMC can't hold as much energy but can deliver it faster... downside is that like LCO, they use lots of Cobalt which is often mined with child labor... and still use lots of nickel so not much better than NiMH cells there... at least Nickel can come from places with good labor standards... or at least it can in theory if governments allow mines to keep operating. LTO can recharge SUPER fast but has low energy density, in a phone it would be like having a recharge that takes like 5 minutes to fill from 20% to 80% (last and first few % take the longest), but you have to recharge 2-3x as often... and LiFePO4 can be used longer than the device will last but has VERY low energy density, similar to that of NiMH, and isnot commonly found in anything... probably because like NiMH and LTO, they basically last forever and thus device makers cannot afford to make a device where the battery (the only consumable part) is able to last like 20 years.
The memory effect is bollocks and something used to label what I would call ‘crap’ batteries. The reason to try to do only complete charges is connector wear. Li-Ion should not be kept full.
What you're saying is correct, NiMH batteries are getting way better on low self-discharge rate, but I do think that your use case is not at all like batteries in a remote. Heavy usage of a keyboard uses a lot more power than a TV remote. In a keyboard I would say low self-discharge NiMH are indeed superior, but for a remote control, or even for just keeping batteries on the shelf, alkaline is still superior.
Eneloop pro are the best batteries ever manufactured. They just gotta be constantly used and recharged but if you leave it sit it doesn’t matter, they have virtually no memory effect so I would suggest you could even top them off after they are half empty
@@dampandrew Thats true. New genaration Ni-Mh batteries don't suffer memory effect. We have something other effect known as "lazy battery" it's something else than memory effect and can be easily repaired by complete discharge battery before next recharche(good charchers offers functionality like that)
TheKrisu091 you are referring to voltage depression. this can potentially make some devices think the battery capacity is lower than it actually is. To prevent it the cell can be charged at 0.1C for example a 2500 mAh can get juiced up with 250 mA for the to prevent dentrite crystal accumulation between the electrodes.
@@dampandrew I'm not so sure but i heard somewheere that Ni-Mh batteries don't like 0.1C. Is better to use something like 0.2-0.5C. I don't know why but i'm sure that i know that from some specialist source. 0.1C was a only good way to recharche old NiCd batteries. For NiMh is better to use higher charching current.
Lithium loves the cold and abhors the heat and humidity its why electric cars die so quickly and catch fire so often in the Texas gulf coast region, I had several friends who had electric and hybrid cars several batteries later they now drive gas and diesel and refuse to talk about the cost of ownership
This is like comparing apples with oranges and bananas. 1,5 volt alkalaine AA cells can never be substituted by 3,7 volt lithium cells, neither can NiMH cells, as the form factor is different. 1,2 volt NiMH cells is not perfect substitutes for 1,5 volt alkalines either, as alkalines typically stop working in many applications when the voltage drops to 1,2 volts...
Nimh battery is better and To balance nimh battery packs, a circuit with two 1n4007 diodes in series plus a resistance of 1 to 10 ohms is used.The voltage drop in each diode is 0.7 volt x 2 is 1.4 volts.The resistance limits the intensity of the balancing current. Being soldered to all Ni cells this increases the life and performance of the battery pack.
NiCads suffer from a memory effect phenomenon. NiMH have a higher capacity for a given size of battery but without exhibiting a memory effect phenomenon
It's more than fine. NiMH does not get a memory effect. That dishonor belongs to NiCd. NiMH can sometimes develop a voltage depression if you only ever discharge to the same level, however, lazy battery effect voltage depressions are easily reversed, just drain and recharge once or twice... and it's good as new. NiMH in Prius cars were only charged and discharged from 80% down to 20% and back, sometimes even less depending on which software version you had. This made them vastly outlast the warranty period, sometimes even in harsh conditions. Then again, prius cars had a small computer to manage the battery and keep it running correctly so doing this for you is not worth the effort, given how many thousands of cycles good NiMH cells can last even if fully charged and discharged... I wouldn't worry about it. Just don't let them go below dead, most devices don't have cut offs like they do for Lithium ion because NiMH is so stable, safe, and is used in devices made for disposable cells, manufacturers get away with abusing them and they still last a long time, so things like a low voltage cut off are often omitted. Generally, the battery is dead in high current devices when performance suddenly drops, for my flashlights, they will run and run and run at peak power, then about halfway the flashlights controller will only output 70% power (IDK why, the cells could still do full power, I've tested), then when dead the flashlight suddenly can't get above 10% power... that means even though the light is still on, the cells are depleted since they just went high resistance. Lithium ion does something similar but they never are allowed to go that low because that would be a fire hazard... NiMH is so safe and stable that they wont do that, you can damage them beyond usefulness and they usually just get a little warm... less warm than when they're charging, they're incredibly safe. So in short. yeah use the cells normally, they'll be fine. The ONE thing not to do is to try to drain them until they're so dead nothing happens. Not so bad in a single cell or parallel cells, but in series cell packs, one cell is always a tiny fraction weaker (no two cells of any chemistry are identical), and it dies first and the others drive it in reverse... damaging the cell. Don't worry, even though most devices have no safety cut offs like are mandatory for Lithium ion for fire hazard reasons, you can still be sure the pack is dead or is good, they NiMH cells will deliver almost full power and when they die, one or more cells go high resistance, they stop delivering full current and you feel this as a device runs a full power and then just... drops off a cliff. There is usually no fade with good cells unless the cells are like 25 years old and abused for 2x their rated cycle life, good cells just go and go and go and then when they are dead, they die. You notice the sudden loss of power output and throw them into the charger, no damage is done, the cells live another day. Don't overthink this. I just run my devices until they either look a little dimmer / feel slower, or I recharge early when convenient. I always have a spare set of cells on me so I just replace them with fresh ones and I'm good to go, I don't even care about how full or dead my stuff is as long as I have my spares. I know that my spares easily outlast a working day, so I could start working, lose power in 5 minutes, swap cells, and be back in action in 30 seconds and be fine for the whole day. As I said, my spare battery packs have enough cells for each device they go with to last all day... usually that is just one change of batteries per pack, times however many packs I need to last long enough to recharge one pack... with this setup, I have infinite battery life because my chargers will be done recharging a set when the next set is dead, so I can keep this up indefinitely. No USB recharging means my one light or my one tool, or whatever I am using is able to operate literally all day. My phone however, when it dies is now tethered to a wall for a while as it slowly charges, and battery banks are just beyond stupid, you drain a battery into another battery which ends up losing at least 10% of the power you put in, usually more. Same goes for my Lithium ion devices, they all either ship with replaceable 18650 cells, or I have modified them to take an external power source or added an 18650 holder. Reason is the same as NiMH, I like to have infinite battery life and I hate recharging one battery from another, so I just have spares of all the cells I need to get to the next charger. If a device dies, I just replace the cell with a fresh one and in 30 seconds I am off to the races again. No down time is acceptable for me. I cannot afford to have my equipment tethered to a wall, many devices wont operate correctly if at all when plugged in to a USB charger, and when they do, recharging a battery with a battery over USB is wasteful, bulky, and the cables get in the way. Much easier to make like a NiMH pack, and recharge outside the device WHILE your spare battery runs the device for literally infinite battery life.
As I've mentioned before, eneloop is merely an improvement of NiMH with a longer shelf life. As for other things, it behaves very much like any other NiMH battery, and is awesome compared to alkaline and kind of disappointing when compared to newer types of cells such as li-ion, lipo and LiFePO4 considering energy/power density, lifespan, charging characteristics and versatility.
LiFePO4, Lithium titanite, and NiMH. The first two are lithium ion battery types (lithium ion is a family of batteries based on shuttling lithium ions around, there's dozens of them), they are known for long cycle life, the former LiFePO4 can withstand about as many cycles as Nickel Hydrogen (like NiMH but a pressure vessel instead of a metal hydride, LONG lived, used in satellites for the ability to last 100 000 to 1 000 000 or more cycles), Lithium titanite is able to withstand a fair few cycles, around a few thousand, and can safely recharge 80% of their capacity in like 10-20 minutes... but their energy density is low, like as low as LiFePO4 and NiMH. NiMH has been on the market for a LONG time, despite Lithium ion being the older technology, NiMH was commercialized first, therefore I would think more nations can recycle them properly, and they also have STUPID long cycle lives. Good Japanese made NiMH cells can go for more than 2000 charge cycles (tested, apparently they bothered to test that claim), and they don't self discharge, or at least the low self discharge ones don't, eneloops are made by FDK, sold to Panasonic for resale to us as Eneloop brand cells, they can hold a charge for >10 years on the shelf, they're stable, they're safe, and they are a drop-in replacement for alkaline which makes them fantastic for the environment as each NiMH AA or AAA sized cell will replace ~1500-4000 ish alkaline cells if treated nicely depending on current draw (higher current hurts them less than alkaline so at high load 1 nimh cell lasts as long as several alkaline cells, per charge, times 2000 charges). So NiMH replacing Alkaline is VERY good for the environment... they just keep going and outlast many of the devices I use them in... I've got cells that are as old as I am and still hold a charge... despite having been through 1500 cycles (those ones are old and were only rated to 1000 cycles... they're 50% older than they're rated to last), Lithium ion in most consumer devices is LCO or NMC type (Lithium cobalt oxide or lithium nickel manganese cobalt oxide), they are not as long lived and have conflict metals like cobalt in them... this is why a phone battery only lasts a year or two, lithium cobalt oxide has highest energy density of all lithium ion family members, but is least stable, most explosive, and only lasts a short time, think 200-600 cycles tops, NMC is less energy dense, sometimes up to 30% less energy than the other one, but has higher power output rates so can charge and discharge faster... but they also have conflict metals and are not overly long lived, longer than LCO cells but they're only really looking good in terms of cycle life when compared against LCO cells... NiMH, LTO, and LiFePO4 outlast them by 2x all the way to 50x the cycle life depending on the particular use case. In some cases NiMH can outlast LiFePO4 despite LiFe having the on-paper higher cycle life... like by a lot. NiMH is very stable so can tolerate abuse very well, LiFe is almost as tolerant but not quite. It is possible to have LiFe outlast NiMH and also possible to see NiMH outlast LiFe, it all depends on lots of factors like temperature, discharge rate (how many amps for the load vs how many amp hours is the battery), charge speed, depth of discharge, etc. Really the winners in environmental terms are NiMH, LiFe, and LTO a.k.a Lithium Titanate.
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Thanks for the very clear and easy to understand explanation! Saved me a lot of research into something I just needed a basic answer for.
Loved this video, simple and understandable explanation!
Great information, but modern, good NiMh cells do not have the memory effect, and also do not self-discharge like obsolete chemistries. Panasonic's standard Eneloops are rated(and independently tested) for 70% after 10 years.
Eneloops(and other LSD NiMh cells) still have a higher self-discharge rate than the best Li-ion cells though(I believe).
It's true that a modern eneloop battery is much better than older ones, but it's still an NiMH battery, and the memory effect is simply one of the properties of such a battery. It can be pretty small because of clever technology, but it will always be there.
On top of that, we're now reaching the limits of what we can do with NiMH, this is about the best we can squeeze out of it, whereas a lot of improvements can still be made on the Li-ion and Li-poly side.
The modern ni mh battery is superior to lithium.
I was going to tell the video presenter the same thing. NiCa suffered from the memory effect not NiMh.
Thanks for the video!! very useful info, nice voice and THANKS a TON for not putting an irritating high-volume music in the background !!! you deserve a tripple LIKE for that ;-)
I think NiMH batteries don't suffer from memory effect.
NiCd has memory effect. NiMH has a voltage depression. It's harder to give NiMH a voltage depression than to give NiCD memory effect, and unlike a memory effect, a voltage depression is easily reversed. Just drain and recharge once or twice and it's gone. NiMH does not suffer a memory effect, you are correct.
AKIO TV: "The Lithium-Ion battery is the winner. It's probably the best type of battery out there."
Lithium-Polymer battery: I'm gonna end this man's whole career.
they do not have the same energy density nor lifespan as a lithium-ion.
Lithium polymer is just a polymer pouch version of Lithium ion. Lithium is an umbrella term and has dozens of sub-types. I assume LiPO cells are ale to deliver high current because they are probably NMC type cells (Lithium Nickel Manganese Cobalt Oxide) which have lower energy density but higher power output rate than LCO (Lithium cobalt oxide). LiPO also are more likely to have a tab-less design than the cylindrical can cells like 18650. You're literally saying that Lithium ion in a pouch format has better characteristics than Lithium ion in can for does... I mean I see why you'd say that but it's just not true. Take a LiPO from a laptop and a 18650 cell from a laptop... they'll be VERY close. The only two advantages LiPO Lithium ion has over the can style lithium ion is they are easier to make tabless and the polymer pouch is lighter than a steel can. However, with the advent of tabless can cells, this advantage is nullified, so the only difference is their polymer pouches are light and can take a variety of shapes which makes some devices easier to design. However, Steel cans are sturdy and don't run the risk of delaminating and puffing up like Lipo style cells can, so again they have their own advantages... spot welded metal strips allow for fast connections that are physically strong between physically sturdy steel canister cells, Lipo needs a shell to be safe, that shell can be in the device or around the battery.
However, chemically and electrically, lipo is Lithium Ion every bit as much as 18650 canister cells are. Make them the same and they'll perform identically.
I think "explode" is a bit of an overstatement, even when li-ion batteries do fail its fairly uncommon to get more than some smoke
Thank you for making my this!! You just saved my poor soul a good 30 mins of research.
np
Modern, Japanese made, low self discharge NiMH cells last years on the shelf or in low drain devices and they don't really have memory effects anymore. The minimal voltage depression that NiMH can sometimes get when repeatedly partially discharged is easily reversed. NiCd is the one which suffered memory effects. I have NiMH cells that have had partial discharges repeatedly and in the worst possible ways... no memory effect, not even a little. Modern NiMH batteries are really tough and rugged, they can be recharged many many times more than lithium ion can... and they are almost always a standard AA cell these days as we don't really bundle proprietary NiMH batteries with devices anymore... that is what they do with Lithium ion instead. So NiMH can be switched out for a fresh set when dead which makes recharging a non-issue as you can just have enough cells recharging that a new set is ready to go when the last one is dead, and modern smart chargers can recharge them fairly fast while still being safe and providing long life.
Now these all depend on which type of Lithium ion you reference, see the cellphone battery and a tool battery are not just different in size and capacity, their internal structure and chemistry are different. Tool batteries and most EV batteries are NMC type Lithium ion (Lithium nickel Manganese Cobalt Oxide), a phone battery is usually LCO (Lithium Cobalt Oxide), and there are also weird ones like LFP (Lithium Iron Phosphate, LiFePO4). Lithium Cobalt Oxide LCO that is in a phone or laptop is the highest energy density Lithium ion variant and is also the most volatile and unstable chemistry, more likely to explode if mishandled and also the least long lived... some are rated to only a few hundred charge cycles, if even that and I've seen them die after only 100 cycles if used by people who are careless or leave their device fully dead or fully charged all the time. NMC lithium manganese cobalt oxide are used in tools because they are more stable, less likely to explode and vent massive flames if mishandled, and have higher output power and longer cycle life than LCO types... downside is they have lower energy density. Then there are weird variants like LFP (LiFePO4) and LTO (Lithium Titanite), LiFePO4 is known for getting absolutely stupid cycle life (sometimes beating NiMH which is impressive) and their extreme stability when mishandled... often being almost as forgiving as NiMH... however their energy density is very low, almost as low as NiMH... seeing a pattern yet? And LTO are very interesting because they are stable and safeish, not quite as long lived as LiFePO4, not even close, usually about half the cycle life, but they have a peculiar ability to safely recharge from 0% to 90% in like 10-20 mins... safely. However, their energy density is low, like as low as LiFePO4 and NiMH.
NiMH is LONG lived, modern Japanese manufactured cells can hold a charge on the shelf for more than 10 years (sometimes longer than alkaline cells), they can withstand 100's of charge cycles if handled correctly, I have old cells made 20 years ago that have probably around 1500 cycles before they were rated to go that long, they were used and abused in extreme cold and extreme heat (think used and charged harshly in both -40C and +55C temperatures... like very hot and very cold)... they still hold 100% of their rated capacity but their current delivery has fallen a bit... they're still about as powerful as a 75% charged alkaline cell their size though... but when new, a modern NiMH can deliver easily 4X the current of a similar sized alkaline cell without breaking a sweat. They're usually not quite as powerful as NMC cells or LTO cells but they are still very powerful for their size.
Trouble with saying anything about Lithium ion cells is that there are so many different types of Lithium ion cell that it just doesn't apply to all of them. LCO cells aren't all that powerful but have slightly higher energy per unit weight so are used in low power devices like phones that need more talk time minutes to sell them... and the short lifespan means you'll want a new phone every year or 2 which is great for the phone makers. NMC can't hold as much energy but can deliver it faster... downside is that like LCO, they use lots of Cobalt which is often mined with child labor... and still use lots of nickel so not much better than NiMH cells there... at least Nickel can come from places with good labor standards... or at least it can in theory if governments allow mines to keep operating. LTO can recharge SUPER fast but has low energy density, in a phone it would be like having a recharge that takes like 5 minutes to fill from 20% to 80% (last and first few % take the longest), but you have to recharge 2-3x as often... and LiFePO4 can be used longer than the device will last but has VERY low energy density, similar to that of NiMH, and isnot commonly found in anything... probably because like NiMH and LTO, they basically last forever and thus device makers cannot afford to make a device where the battery (the only consumable part) is able to last like 20 years.
Check Low-Self Discharge NiMH. They don't discharge much, not much memory effect and even capacity almost as good as alkaline
The memory effect is bollocks and something used to label what I would call ‘crap’ batteries. The reason to try to do only complete charges is connector wear. Li-Ion should not be kept full.
great video, but NIMH eneloops discharge rate are reaching alcaline, i had 2 AAA eneloops running my wireless keyboard for a year heavy usage .
What you're saying is correct, NiMH batteries are getting way better on low self-discharge rate, but I do think that your use case is not at all like batteries in a remote. Heavy usage of a keyboard uses a lot more power than a TV remote. In a keyboard I would say low self-discharge NiMH are indeed superior, but for a remote control, or even for just keeping batteries on the shelf, alkaline is still superior.
Eneloop pro are the best batteries ever manufactured. They just gotta be constantly used and recharged but if you leave it sit it doesn’t matter, they have virtually no memory effect so I would suggest you could even top them off after they are half empty
@@dampandrew Thats true. New genaration Ni-Mh batteries don't suffer memory effect. We have something other effect known as "lazy battery" it's something else than memory effect and can be easily repaired by complete discharge battery before next recharche(good charchers offers functionality like that)
TheKrisu091 you are referring to voltage depression. this can potentially make some devices think the battery capacity is lower than it actually is. To prevent it the cell can be charged at 0.1C for example a 2500 mAh can get juiced up with 250 mA for the to prevent dentrite crystal accumulation between the electrodes.
@@dampandrew I'm not so sure but i heard somewheere that Ni-Mh batteries don't like 0.1C. Is better to use something like 0.2-0.5C. I don't know why but i'm sure that i know that from some specialist source. 0.1C was a only good way to recharche old NiCd batteries. For NiMh is better to use higher charching current.
i had a nimh battery shaver, Norelco, those things completely drain out within 2-3 yrs, trying another shaver with lith-ion, hopefully lasts longer
Lithium loves the cold and abhors the heat and humidity its why electric cars die so quickly and catch fire so often in the Texas gulf coast region, I had several friends who had electric and hybrid cars several batteries later they now drive gas and diesel and refuse to talk about the cost of ownership
This is like comparing apples with oranges and bananas. 1,5 volt alkalaine AA cells can never be substituted by 3,7 volt lithium cells, neither can NiMH cells, as the form factor is different. 1,2 volt NiMH cells is not perfect substitutes for 1,5 volt alkalines either, as alkalines typically stop working in many applications when the voltage drops to 1,2 volts...
nimh 🔋 don’t suffer from the memory effect
Nimh battery is better and To balance nimh battery packs, a circuit with two 1n4007 diodes in series plus a resistance of 1 to 10 ohms is used.The voltage drop in each diode is 0.7 volt x 2 is 1.4 volts.The resistance limits the intensity of the balancing current. Being soldered to all Ni cells this increases the life and performance of the battery pack.
NiCads suffer from a memory effect phenomenon. NiMH have a higher capacity for a given size of battery but without exhibiting a memory effect phenomenon
Great simole explanation 👍🏼
nice video bro covered all details i needed to know
When buying hair clippers wht battery type of hair clippers is best?
Alkaline freezes and can burst also right?
I love the way you dd this
Good explanation. Keep it up.
Loved the video, thanks!!
Worth watching!
NIMH battery have NO MEMORY EFFECT How can anybody miss correcting this misinformation?!?
Ty for the video. Is it bad if you charge an empty NiMH battery to less than 100%?
It's probably fine, but I wouldn't do it too often.
It's more than fine. NiMH does not get a memory effect. That dishonor belongs to NiCd. NiMH can sometimes develop a voltage depression if you only ever discharge to the same level, however, lazy battery effect voltage depressions are easily reversed, just drain and recharge once or twice... and it's good as new. NiMH in Prius cars were only charged and discharged from 80% down to 20% and back, sometimes even less depending on which software version you had. This made them vastly outlast the warranty period, sometimes even in harsh conditions. Then again, prius cars had a small computer to manage the battery and keep it running correctly so doing this for you is not worth the effort, given how many thousands of cycles good NiMH cells can last even if fully charged and discharged... I wouldn't worry about it. Just don't let them go below dead, most devices don't have cut offs like they do for Lithium ion because NiMH is so stable, safe, and is used in devices made for disposable cells, manufacturers get away with abusing them and they still last a long time, so things like a low voltage cut off are often omitted. Generally, the battery is dead in high current devices when performance suddenly drops, for my flashlights, they will run and run and run at peak power, then about halfway the flashlights controller will only output 70% power (IDK why, the cells could still do full power, I've tested), then when dead the flashlight suddenly can't get above 10% power... that means even though the light is still on, the cells are depleted since they just went high resistance. Lithium ion does something similar but they never are allowed to go that low because that would be a fire hazard... NiMH is so safe and stable that they wont do that, you can damage them beyond usefulness and they usually just get a little warm... less warm than when they're charging, they're incredibly safe.
So in short. yeah use the cells normally, they'll be fine. The ONE thing not to do is to try to drain them until they're so dead nothing happens. Not so bad in a single cell or parallel cells, but in series cell packs, one cell is always a tiny fraction weaker (no two cells of any chemistry are identical), and it dies first and the others drive it in reverse... damaging the cell. Don't worry, even though most devices have no safety cut offs like are mandatory for Lithium ion for fire hazard reasons, you can still be sure the pack is dead or is good, they NiMH cells will deliver almost full power and when they die, one or more cells go high resistance, they stop delivering full current and you feel this as a device runs a full power and then just... drops off a cliff. There is usually no fade with good cells unless the cells are like 25 years old and abused for 2x their rated cycle life, good cells just go and go and go and then when they are dead, they die. You notice the sudden loss of power output and throw them into the charger, no damage is done, the cells live another day.
Don't overthink this. I just run my devices until they either look a little dimmer / feel slower, or I recharge early when convenient. I always have a spare set of cells on me so I just replace them with fresh ones and I'm good to go, I don't even care about how full or dead my stuff is as long as I have my spares. I know that my spares easily outlast a working day, so I could start working, lose power in 5 minutes, swap cells, and be back in action in 30 seconds and be fine for the whole day. As I said, my spare battery packs have enough cells for each device they go with to last all day... usually that is just one change of batteries per pack, times however many packs I need to last long enough to recharge one pack... with this setup, I have infinite battery life because my chargers will be done recharging a set when the next set is dead, so I can keep this up indefinitely. No USB recharging means my one light or my one tool, or whatever I am using is able to operate literally all day. My phone however, when it dies is now tethered to a wall for a while as it slowly charges, and battery banks are just beyond stupid, you drain a battery into another battery which ends up losing at least 10% of the power you put in, usually more.
Same goes for my Lithium ion devices, they all either ship with replaceable 18650 cells, or I have modified them to take an external power source or added an 18650 holder. Reason is the same as NiMH, I like to have infinite battery life and I hate recharging one battery from another, so I just have spares of all the cells I need to get to the next charger. If a device dies, I just replace the cell with a fresh one and in 30 seconds I am off to the races again. No down time is acceptable for me. I cannot afford to have my equipment tethered to a wall, many devices wont operate correctly if at all when plugged in to a USB charger, and when they do, recharging a battery with a battery over USB is wasteful, bulky, and the cables get in the way. Much easier to make like a NiMH pack, and recharge outside the device WHILE your spare battery runs the device for literally infinite battery life.
how recyclable are these batteries?
Thanks very useful!
Well done!
Thanks!!!
man cool explanation
Thanks
Dude where did you get that phone haha
Okay c’mon Spongebob soundtrack!
I've had alkaline batteries destroy so many things and
*cough* Eneloop *cough*
As I've mentioned before, eneloop is merely an improvement of NiMH with a longer shelf life. As for other things, it behaves very much like any other NiMH battery, and is awesome compared to alkaline and kind of disappointing when compared to newer types of cells such as li-ion, lipo and LiFePO4 considering energy/power density, lifespan, charging characteristics and versatility.
Omg annoying voice but pretty good work, continue. +1 subs
But.. which is the best for the environment?
LiFePO4, Lithium titanite, and NiMH. The first two are lithium ion battery types (lithium ion is a family of batteries based on shuttling lithium ions around, there's dozens of them), they are known for long cycle life, the former LiFePO4 can withstand about as many cycles as Nickel Hydrogen (like NiMH but a pressure vessel instead of a metal hydride, LONG lived, used in satellites for the ability to last 100 000 to 1 000 000 or more cycles), Lithium titanite is able to withstand a fair few cycles, around a few thousand, and can safely recharge 80% of their capacity in like 10-20 minutes... but their energy density is low, like as low as LiFePO4 and NiMH. NiMH has been on the market for a LONG time, despite Lithium ion being the older technology, NiMH was commercialized first, therefore I would think more nations can recycle them properly, and they also have STUPID long cycle lives. Good Japanese made NiMH cells can go for more than 2000 charge cycles (tested, apparently they bothered to test that claim), and they don't self discharge, or at least the low self discharge ones don't, eneloops are made by FDK, sold to Panasonic for resale to us as Eneloop brand cells, they can hold a charge for >10 years on the shelf, they're stable, they're safe, and they are a drop-in replacement for alkaline which makes them fantastic for the environment as each NiMH AA or AAA sized cell will replace ~1500-4000 ish alkaline cells if treated nicely depending on current draw (higher current hurts them less than alkaline so at high load 1 nimh cell lasts as long as several alkaline cells, per charge, times 2000 charges).
So NiMH replacing Alkaline is VERY good for the environment... they just keep going and outlast many of the devices I use them in... I've got cells that are as old as I am and still hold a charge... despite having been through 1500 cycles (those ones are old and were only rated to 1000 cycles... they're 50% older than they're rated to last), Lithium ion in most consumer devices is LCO or NMC type (Lithium cobalt oxide or lithium nickel manganese cobalt oxide), they are not as long lived and have conflict metals like cobalt in them... this is why a phone battery only lasts a year or two, lithium cobalt oxide has highest energy density of all lithium ion family members, but is least stable, most explosive, and only lasts a short time, think 200-600 cycles tops, NMC is less energy dense, sometimes up to 30% less energy than the other one, but has higher power output rates so can charge and discharge faster... but they also have conflict metals and are not overly long lived, longer than LCO cells but they're only really looking good in terms of cycle life when compared against LCO cells... NiMH, LTO, and LiFePO4 outlast them by 2x all the way to 50x the cycle life depending on the particular use case.
In some cases NiMH can outlast LiFePO4 despite LiFe having the on-paper higher cycle life... like by a lot. NiMH is very stable so can tolerate abuse very well, LiFe is almost as tolerant but not quite. It is possible to have LiFe outlast NiMH and also possible to see NiMH outlast LiFe, it all depends on lots of factors like temperature, discharge rate (how many amps for the load vs how many amp hours is the battery), charge speed, depth of discharge, etc.
Really the winners in environmental terms are NiMH, LiFe, and LTO a.k.a Lithium Titanate.
Thanks