What's inside a 9V NiMH Rechargeable Battery?
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- เผยแพร่เมื่อ 17 เม.ย. 2018
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I take apart (willingly) a trashy 9V Nickel Metal Hydride rechargeable battery, branded GodP, and find seven poor quality cylindrical cells wired in series.
Then I take apart (reluctantly) a high quality Vapex 9V NiMH battery and find 7 prismatic (or cuboid) cells which properly fill the space inside the plastic case. - วิทยาศาสตร์และเทคโนโลยี
one big warning for anyone considering replacing a regular/rechargeable 9V PP3 cell with the Li-Ion kind DON'T USE IT IN YOUR SMOKE DETECTORS or other life critical devices. The boost circuitry suddenly drops out and leaves you no time for a low battery warning !
some of the other brands have 2 li-ion in series (without boost converter) that will work in smokes just fine. They have a charged voltage of only 8.4 or something.
hey man if you go full DIY and worry,about this at all theres low lipo alrams for hobbyists, you just add one of them inside the detector!!!!
I totally felt your pain ripping the good batteries apart, but thanks for doing it. You’re a good egg.
375 patrons @ a total of $567 per month. I'm sure he can afford to drop a few dollars.
Plus the $500 and change from his Patreon. Guess he spends that on steak and lobster.
The batteries are still usable, in fact, they're now slimmer without the case, so they'd fit even better.
Thanks for sacrificing your battery for us. Very interesting.
I have a few 9V lithium and they are just made with two pouch type cells inside so they are 7.4V nominal or 8.4V fully charged. I use them in my multimeter and some other similar devices and I just charge them with a Lab power supply to 8V every few months when is needed.
Unless you need the small size, AA NiMH cells are probably the way to go.
The capacity is relatively good, you won't need a new charger and you don't need to be concerned about over discharging.
Thanks for tearing it apart, I suspected as much. Those little cylindrical batteries are likely 1/3 AA NiMH industrial sizes, I'm surprised to see anyone still making NiMH cells in flat pack, that can only be a custom job; quite expensive to do today and is probably why its a better performer. The 9V made out of 1/3 AA "cells" are easier to make and should perform as well, if the parts used perform as specified. You can probably isolate the bad cell and recondition it, and it could get the pack working again. A problem with 9V NiMH is the internal cells are in series, charging is done as a pack, so there is no battery balancing. en.wikipedia.org/wiki/Battery_balancing www.master-instruments.com.au/category/NiMH_Industrial_Cylindrical_Batteries/1175
I can't believe you haven't discovered Ikea Ladda batteries!
Very cute micro cells. Haven't seen those before. Could be fun for micro projects.
good on you for opening the instant 9v. liked this video.
Thanks for saving me from opening up some by myself. I always wondered what is in them. Now I even wonder if opening them to extract some of the tiny cells might be worth it to power some tiny gadgets I'm planning to build.
I got the OKCell 9v, very practical with the USB charger port. Inside there is a single lithium cell with a booster and the charging circuit. Probably not the most efficient solution like the dual cell ones, but they do their job and hold a 9V steady output (probably not the best if your device has a battery indicator but there is a battery indicator on the side of the casing)
Have you tried the 8 cell 9.6V type rechargeables? I've often had equipment not liking the low voltage of the 7 cell 8.4V type and giving low voltage warnings even though they were pretty much charged. 9.6V seems to be a much better voltage to replace a 9V alkaline.
hi the 9v lithium battery's with the usb charging function use a boost converter and the ones without have 2 cells in series with inbuilt protection but require a different charger
I remember buying 10 rechargeable 9v batteries from China. They were supposed to be pit in smoke detectors and various tools. It only took 1 week before the first battery fell apart. It literally fell apart as I was about to recharge it. I'm only using Varta these days, that's quality for cheap.
I've also come across 9V NiMH cells that have 7 AAAA cells in series, that was from the Uniross brand.
Just go for Soshine batteries. You will absolutely like them. I had both NiMh and lithium 9v Soshine batteries, and I can tell you they are rock awesome.
I have some EBL "9v" rechargeables. They are self-regulated (over/under protection/etc). But I found if I feed it say 10V it'll charge for a bit and then cut off. Usually long before the battery is charged whereas if I feed it 8.4V it charges fully. So if your charger is feeding 9V (or more) some cells might cut off before being fully charged.
That 9v battery holder is meant to be tight, you can loosen it up a little by softening/opening the plastic(s) - they have a gap between them and not connected at the terminal end also, so they pull out slightly and spring to 'grip' the battery - heat up lightly and bend out slightly will loosen it up! ;)
Also, try fitting it in after taking the label off ;)
You've said 'volumetric' so many times it doesn't sound like a word anymore.
My Ni-MH 9V batteries had 7 Ni-Cd cells in it. And if you store them charged (as you should do with Ni-MH) they loose capacity pretty quickly. And they also self-discharge. That's Why I buy only Li-Ion. There are two flat cells in my Li-Ion 9V batteries. They work nice, but since the voltage is on the low side you can't use the full capacity in the most devices. But they don't self discharge
I'm pretty happy with my soshine LiFePO4 9V batteries. They put out up to 2A and have plenty of capacity.
Is that one cell with a booster, or 3 cells in series?
I believe it is 3 cells. The voltage output varies a bit as it discharges. It starts off at nearly 10V and cuts off somewhere below 8V. If it had a booster, I would think it would always hold the voltage at 9V.
I could check it this weekend.
Hi Julian, really enjoy your videos. Can I ask, will you be releasing your code for the PWM5 as your website is gone, to go with your pcb. Also looking forward to any Muppet 2 videos, I came late to the party, but I have been enjoying the Muppet 1 videos. Keep up the good work! All the best!
Awesome review
Ive got a couple of Lloytron branded 9v NiMHs that seem to live up to their 250mAh rating. Also 50g. Will not open them tho, I like them too much and theyre very useful.
Think the best thing would be a AA battery holder with 6x 1.5V alkalines, or 7-8x Ni-MH batteries - that way you'll get the voltage required, in a far higher capacity. Only issue is the size of the homemade 9V setup compared to a PP3 battery, but you can't have a small battery that is also high capacity.
Most AA batteries seem to be in the order of 2000mAh each now, or you could even go along the AAA route if you wanted to save space a bit (and sacrifice capacity, as AAAs are only approx 750mAh).
have you tried those rechargeable lithium 9v batteries?
I did some calculations and I think the volume of the cylindrical cell NMiH battery is 61% of the volume of the lozenge battery, and it's 54% of the weight, so not only is it smaller, but it has about 80% of the metal in the lozenge battery by weight
their not trashed, a little bit of epoxy and Roberts ya relative !
andymouse123 Robbert is your father's brother?
+Joel
That's too specific. Besides, traditionally in my country brother of the father and b. of the mother have two different names
No buddy.....Roberts ya relative......... or Bob's your Uncle !
yep bobs ya uncle
*They're
You said lithium 9v would be a noisy power supply. What about a lithium usb power bank. Could you throw a couple on the scope? Maybe throw a usb wall wart on there too for good show?
Great video thank you so I'm best off staying with my pro cell 9 volts as non of the rechargeable 9 volts are actually a full 9 volt as they are 7 cells at 1.2 volts same with most lithium ion "9 volt" are over voltage or under voltage and like you said create noise in audio equipment in say a bass guitar preamp
Those are 1/3 AAA cells. I used them in light RC gliders, back in the dark times before lithium batteries :)
They were Sanyo 110Mah NiCad cells, it'd be terrible if the cells in Julian's pack couldn't even match that....20ish years later.
Imagine if they are 20 year old NiCads repacked :)
*Keep in mind* that those *LiPo 9v batteries* will stay at a certain voltage, then rapidly drop that voltage when the IC senses it running low. This is bad for devices (like smoke/CO detectors) and other voltage dependent devices for warning when the batteries are running low.
Great to see the Muppet project seeing the light of day again. Can't wait to see your solution for the synchronized buck converter.
Instead of a dedicated 9v battery, have you considered an isolated dc/dc converter connected to either the input or output? This would give you an isolated power source to drive the mosfets. Or would this be too noisy of a power supply?
Julian can you build a stereo amplifier clipping circuit with led lights please and thank you:-) :-) for your awesome videos
What a coincidence! I've been sticking my Wilko £2 bulbs on 9 volt batteries too! Would love to stick the bulbs in a lamp but can't find a suitable one 😭
First off I love your videos second i want to create a so called "makers board" using different logic chips and maybe a timer all inside a box with a plug and play type feature to those chips like a breadboard with options already integrated and I would like some input on design or components from you if possible
Buy your batteries in Ikea. Buy the white LADDA ones they are very good. It's the same quality as eneloops
or Lidl
Would it be worth it to solder the broken tab back on then put the battery in a heat shrink sleeve to continue using it or is it not worth the potential risk? It doesn't look like any of the cell casings have been compromised other than some wrapper being nicked.
I spend hours watching youtubers wrestling open plastic cases with screwdrivers, if I tried it even once I'd be in A&E getting stitches again! (last time it was a pen knife lol)
Based on this I'm wondering if choosing a 9v battery is best based on weight? Interesting video!
Yeah, some of the eBay listings feature the battery weight as >50g to suggest they are genuine.
Love it
It seems that Charlie took 7 cylindrical batteries of capacity 40mAh, and so he calculated total capacity 7x40mAh = 280mAh. I think the number came up like that. Of course it is wrong calculation, the capacity of cells in series does not add up.
10:30 - maybe there are 7x130mAh cells so you'd get 900mAh if they were paralleled for 1.2v.
Yeah... someone should tell them that that´s not how that works ;P
hi julian whats the best way to contact you as have some boards you might like
Hi Dave - I appreciate the offer, but due to severe space restrictions, I'm not taking gifts just now. Maybe that'll change when I move abroad :)
np just didnt want to bin them or just keep them in a box gathering dust would you know anyone who might make use of them the list is
www.olimex.com/Products/ARM/NXP/LPC-P2148/ x1
www.olimex.com/Products/ARM/Atmel/SAM7-LA2/ x1
www.olimex.com/Products/ARM/Atmel/SAM7-H256/ x1
www.olimex.com/Products/ARM/NXP/LPC-H2148/ x1
www.olimex.com/Products/AVR/Proto/AVR-USB-162/ x1
also some boards with stickers from
modtronix.com
hp15d-asm x2
io8s x1
hp5d x1
and have
skpang.co.uk/catalog/quick2wire-i2c-analogue-board-kit-p-1191.html about 18 of these just boards
also have a
www.picaxestore.com/en_gb/bas110.html
@@raveruk72 If he doesn't want them, I might...
Thanks for the video Have just purchased some 9v batteries from AliExpress and wondered why they were so light in weight. I'm just waiting for a rechargeable battery charger. Have you ever made at all? the brand i purchased is PALO 9V 6F22 Ni-MH for my Multimeters . Also I'm waiting on a ANENG 618C Digital Multimeter Smart Touch DC Analog Bar True RMS Auto Tester Professional Transistor Capacitor NCV Testers Meter await you testing one of these. Seem really great for a DIY person. Keep up the good work Ross Tga NZ
18650 cells are becoming my standard: 2 in series dropped to 5v and 3 in series dropped to 9 or used as 12v.
Or even a single cell boosted to 5V (with multiple cells in parallel).
It would be funny if those were supercaps hiding in a 9V battery shell!
But why can't rechargeable aa or aaa batteries be 1.5v but 1.2v, while rechargeable 9v batteries can?
Weigh your spare digimax and your Energizer in the next post bag :)
It was very interesting to see the construction of the different NiMh 9 volt batteries and it was obvious why the cheap one performed so poorly. I don't like the idea of boosting a 3.7 v battery to 9v, seems like you would waste a significant amount of energy. What about 8 NiMh AA cells in a holder? You would get 9.6v nominal at 2000 mAh or so or if the voltage is too high just shunt one of the cell compartments.
3 x 3.2v?
not on a kickback but 3 pack of own brand 200mAh 9V Nimh batteries for £9.99 in the maplin closing down sale ;)
I like how you're
comitted to the testing
Blatant product placement again! Julian, you're incorrigible. ;-D
That GodP battery might be using Chinese mAh, whereby you add up the claimed capacities of the individual cells, instead of stating the true capacity of the battery. It's a fair guess that those are (claimed to be) 40 mA cells. So 40mAh x 7 = 280mAh. Allow for Chinese -swindlers- inflating the capacity, plus some aging, and (being generous) a charge current of 90 mA for 12 minutes gives: 90mA/5 = 18 mAh for the true capacity of the battery. Being pessimistic, if your charger delivers 70 mA, and it charges in 10 minutes then the capacity is 70mA/6 = 11.67 mAh, approximately. So it's somewhere between about 12 and 18 mAh.
6 AA or AAA in a batteryholder is the best
what about 4A 9V batteries.
So you're going to show us "the secret of NIMH"?
I just use 2x 14500 Li-ion in a AA battery holder.
JLCPCB ($2 for 10 Boards + $12 for shipping)
Ouch... Using through hole components and stripboard/veroboard would be better, as through hole is easier to solder.
Okurka - Where is that shipping price for? I'm in Canada and $14 for 10 board doesn't sound bad. But how big are those any way? I remember looking at their web page but don't recall seeing any shipping costs listed and didn't want to bother making up a dummy order just to see.
I think the price $2+$12 is for boards not bigger than 10x10cm
why not make a 420mah triple sized battery and with the two left over tops you can use them as plugs...
👍 Great video. I just recently purchased 3 Lithium Ion USB rechargeable 9V from Banggood, but haven't done anything with them yet.
Postal scale my ass, That's how we weighed our pot as kids!
So size matters.
I've got 5 non-USB rechargeable (two cells in series) 9V EBL Li-ion batteries (which I bought with a charger). The advantage of these is higher capacity and lower price. Unfortunately, one of them self-discharged to about 1 V in just 2 months! It's dead and I couldn't revive it. They were in the box supplied to store them, so no short-circuits could have happened. And the rest except 1 were discharged to 5 V or so! Not very good quality... In fact, I've just checked and they've discharged again! At least I can charge them, unlike the other one. There's only one good one, out of the 5! Really disappointed.
im in the middle of making my own 9v battery with a twist, thanks for the vid. if you get the usb recharge one's can u make a vid on them ?
They are lozenges
The 6 vertical cells would only be good for alkaline, nimh would be much to low on voltage at 7.2V to be classed as a 9v
I thought it was Pez.
I'd call the smaller cells "brick shaped". Just for lols.
looks like supercaps
Wrap those batteries in kapton tape, they'll be fine to use...
Why don't you use 18650s with a good boost circuit.
Size matters. He is actually thinking of lipo in 9v backage
Commodity. He could also use 2 Li-ion in series (which is what some "9V" Li-ion batteries are), but is easier to just slide the battery in.
Am I the only one that saw the listing for 3600 MWH batteries?
If it’s too tight getting it in and out, you need some lube...
HKJ tested dissasembled some li-ion 6F22 baterries: lygte-info.dk/info/BatteryDisassembly9VLiIon%20UK.html
One with boost and second one with two cells in series.
Hi Julian. I just noticed the Uno sticker on your nano. Did you know that the Nano officially uses the Optiboot bootloader since the beginning of the year? That's why I had problems myself a few days ago. You can try it by updating the Arduino AVR Core.
Interesting - I must update my Arduino IDE.
He forgot the battery capacities compared to the size.
rip 9v batteries
can you start a project and finish it would be good to see things finished your channel is all over the place.
agreed
ADD lol
Or, you could start your own channel. I mean really, are you paying Julian to produce content? If not, just go with it.
Constructive criticism, Brad. Never heard of that? Then you never grew better in anything.
Hardly constructive given the nature of Julian's channel. His regular viewers know what to expect and therefore we feel no need to critique since it would be pointless so to do.
What about normal 9V batteries?
They are filled with gooey paper with zinc dioxide and manganese dioxide in potassium hydroxide between electrodes. I cut one open as demonstration in a science class.
6x1.5V cells that are a bit smaller than AAAA th-cam.com/video/jMfmjqMIT3A/w-d-xo.html
I also have one like that. Seems to be manufacturer dependant.
Alkaline 9V batteries are the 6 miniature AAAA type cells in series that ProgAndy mentioned and those are usually marked 6LR6, LR6 being the size code for the little cells. Non-alkaline "heavy duty" 9V batteries tend to be the stack of paper and metal separators and gooey paste type cells that Hyss said.
Rayovac 9V alkaline batteries from Malaysia use prismatic cells.
Julian living on the edge
Why not just used to 18650s in series they should work fine
They will indeed, I use two of them to power my little robot buggy.
18650's in series would give a nice amount of capacity, but two of them wouldn't ever reach the full 9V and three of them would be overkill. You'd also need a balance charge controller.
If you want to go down the lithium route them a single cell (or more if you want a parallel array) with a boost converter would be better.
I bought a couple of 9V Li-Ion batteries made by SoShine.
When I did the research, most people raved about them.
I tested one and got 568 mAh and they claimed 650 mAh. Close enough, considering I could only test them at 200 mA discharge rate. I am sure I could've gotten closer to claimed 650, if I discharged them at C/20 as one should.
I have the same dummy load as you (ZPB30A1), and they can't go lower than 0.2A without a R_sense hack.
NiMh is kinda dead technology compared to Li-ion.
Also, don't get the ones with USB charger unless you don't care about halving the capacity.
Here is the link if others are interested;
www.aliexpress.com/item/2pcs-Soshine-650mAh-9V-6F22-Rechargeable-Battery-Smart-Intelligent-Ni-MH-Li-ion-Battery-Charger-with/32802936530.html?spm=a2g0s.9042311.0.0.JfoGQ8
vandal!
first