Just the info I was looking for. I've just about given up on using rechargeables in place of alkaline because of the voltage difference and the low battery alerts.
Hi Ahmad, we explained in the video around 5:15 th-cam.com/video/87ofHLBksBM/w-d-xo.html you might want to consider the Nimh 9V that we linked in our description amzn.to/354oCmT in applications like wireless mics which are designed to work with Alkaline 9Vs - since rechargeable nimh 9V will have a nominal voltage that is more similar to Alkaline 9V batteries.
Would the Ni-Mh or Li-Ion battery be more likely to loose some of its charge while in storage? Like if I charged it & put it away until needed wich one will loose more of its charge?
For storage, we suggest going with the li-ion 9V since it will have a lower self-discharge rate over NiMH 9V. Just be sure to not fully charge the battery before putting it into storage, we recommend charging it to 50% capacity.
Also Low Self-Discharge Ni-MH batteries last years longer than lithium. However if you need more current in each cycle, then lithium is the right choice. For my low current applications, it's cheaper to buy NI-MH 9V. You think high capacity NI-MH batteries are best. Right? Wrong, high capacity NI-MH batteries loose mAh over time so buy low self discharge batteries for NI-MH chemistry type. If you need more mAh, go for the Lithiums. One more comment: Tenergy please make Lifepo4 9v rechargeable batteries.
lifepo4 would be an awkward voltage. nominal voltage for a single LFP cell is 3.2V, meaning, you would have to choose between 6.4V or 9.6V. One is too low and the other a little high.
Thank you for a very professionally produced, informative video! 😊 However, I’m still not certain as to which battery would be best use for a TENS unit that I wear most of the day and night and need long running time for. I’m assuming that it’s not drawing a lot of current but I’m really not sure, as the disposable battery that came with the unit only lasted about 4 hours! I am now using a codec, 9 V extra life alkaline battery, but we’d like to switch to rechargeables. otherwise I’ll go broke going through 9 V batteries daily, at this rate. 😆 Please advise as to which of the two batteries you illustrate would be best for me? Thank you so much for your time and your knowledge.😊
Hi Diana, we suggest a li-ion 9Vs like these linked here: bit.ly/3zyCGRk . Before buying these 9Vs batteries, it's important to first check with the medical device manufacturer, to confirm the voltage range needed. Like we mentioned in the video, rechargeable li-ion 9Vs provide 7.4Vs and NiMH 9Vs provide 8.4V which is more closer to an Alkaline 9V battery. For most cases they will work as replacement, but for medical devices it might require the exact voltage to work properly.
There is a difference of about a whole 0.2 volt between the NiMH and Li-ion. 2x3.7 volts = 7.4 volts. While 6x1.2 volts = 7.2 volts. There's probably something in that clock that oscillates (quartz crystal or such) at a specific known frequency given a specific known voltage. And 7.2 and 7.4 volts probably produce a frequency of oscillation a bit slower than that of a true fully-charged 9v battery that is actually producing 9 actual volts.
"There is a difference of about a whole 0.2 volt between the NiMH and Li-ion. 2x3.7 volts = 7.4 volts. While 6x1.2 volts = 7.2 volts" Actually... the Li-ion has 7 cells, so... 8.4 volts, for a 1.0 volt difference. The 6-cell battery was the Alkaline.
A Ni-MH battery has small round cells inside it. Because you can't pack round cells into a rectangular space well, they have empty space. Manufacturers may also include a fusible metal strip that melts if you short circuit the battery. Then you have to destructively open it to fix. Lithium batteries may have a boost converter inside them to reach 9V from one cell. This one is a big no no in radio. It causes massive interference like all digital crap. A pouch cell can be packed better, but the boost converter takes room and must be insulated from the cell. I can't reach 9V with lithium. It will either be 8.4-6.4 or 12.6-9.6. Ni-MH can be added with smaller increments.
Isn't "the most popular chemistry type" stated at the outset actually Zinc-carbon or manganese dioxide? Perhaps the two types of chargers should be polarized with a peg coming out of the charger at different locations to interface with the correct battery, preventing full insertion of the wrong chemistry and damaging the battery. Please be aware that these cells have significant voltage drop over time or at low temperature. Therefore, even though they work well at first installation, your devices may go into "battery alert" mode to warn you of a low battery when they actually have plenty of capacity. Primary batteries do not have this issue, so your success with using rechargeables in a smoke detector may vary. It would be good to see some discharge curves for these products (voltage vs capacity).
Interesting... can't find one reputable source comparing lithium-ion (rechargeable) vs lithium batteries. Also, I now have experience comparing published estimates of 9v and AA lithium batteries in smoke detectors (claims of 5 to 10 years) and know factually zero last 5 years. let alone 10 (five different type of detectors who made that claim). All are roughly 1 to 3 years. And who? Seriously who? Thought it was a good idea to chirp once a minute on a low battery. Just freaking beep every 5-10 seconds... blink a damn light. Idiots. Nothing is honestly portrayed or designed well these days. Going to try lithium-ion. Who knows. Can't trust data sheets at all. Worthless.
Hmm I had various issues w lithium 9V not many say : after months not even a year they puff inside this anyone that has used for years lithium lion pouches( which are inside the battery ) can ouff and start a small or big smoke and can even get to a heat level at charging and start some Hazards again not always will happen to everyone that doesn’t used them daily on higher drains , I would use in delicate gear , the old tech works better for safety . Is there a way to know when battery has puff to avoid this ? Not only your brand I’m talking overall other brands ( energizer also has this issue but with the old tech 🫢
Hi Charls, this might be a result of how you're storing the 9V li-ion batteries. Please try to keep in a cool dry place, the ideal temperature range is between -4F to 68F. For more information please contact our team at service@tenergy.com and they can help you find out how to tell if your 9V battery has puffed or has issues.
Brilliant video! Thanks
Thanks, it took a lot of searching to get this explanation.
This was so helpful! And explains exactly the problem I'm having with my guitar! I might have to use non-rechargable :/
Just the info I was looking for. I've just about given up on using rechargeables in place of alkaline because of the voltage difference and the low battery alerts.
Nice informative vid! Which one is more durable?
Very well done Thanks!
Are there any 9volt rechargeable batteries that recharge up to the full 9.6volts ?
thanks alot. but i have a que. please.. i have a wireless mic and want to get rechargeable battery 9 volts ... the final decision is which one..?
Hi Ahmad, we explained in the video around 5:15 th-cam.com/video/87ofHLBksBM/w-d-xo.html you might want to consider the Nimh 9V that we linked in our description amzn.to/354oCmT in applications like wireless mics which are designed to work with Alkaline 9Vs - since rechargeable nimh 9V will have a nominal voltage that is more similar to Alkaline 9V batteries.
Would the Ni-Mh or Li-Ion battery be more likely to loose some of its charge while in storage? Like if I charged it & put it away until needed wich one will loose more of its charge?
For storage, we suggest going with the li-ion 9V since it will have a lower self-discharge rate over NiMH 9V. Just be sure to not fully charge the battery before putting it into storage, we recommend charging it to 50% capacity.
Also Low Self-Discharge Ni-MH batteries last years longer than lithium. However if you need more current in each cycle, then lithium is the right choice. For my low current applications, it's cheaper to buy NI-MH 9V. You think high capacity NI-MH batteries are best. Right? Wrong, high capacity NI-MH batteries loose mAh over time so buy low self discharge batteries for NI-MH chemistry type. If you need more mAh, go for the Lithiums. One more comment: Tenergy please make Lifepo4 9v rechargeable batteries.
lifepo4 would be an awkward voltage. nominal voltage for a single LFP cell is 3.2V, meaning, you would have to choose between 6.4V or 9.6V. One is too low and the other a little high.
@@Thelango99 9.6V would work fine for me. Lifepo4 9V size needs to exist.
If the cells are fresh and full, you'll have 10.6V.
Thank you for a very professionally produced, informative video! 😊
However, I’m still not certain as to which battery would be best use for a TENS unit that I wear most of the day and night and need long running time for. I’m assuming that it’s not drawing a lot of current but I’m really not sure, as the disposable battery that came with the unit only lasted about 4 hours!
I am now using a codec, 9 V extra life alkaline battery, but we’d like to switch to rechargeables. otherwise I’ll go broke going through 9 V batteries daily, at this rate. 😆
Please advise as to which of the two batteries you illustrate would be best for me?
Thank you so much for your time and your knowledge.😊
Hi Diana, we suggest a li-ion 9Vs like these linked here: bit.ly/3zyCGRk . Before buying these 9Vs batteries, it's important to first check with the medical device manufacturer, to confirm the voltage range needed. Like we mentioned in the video, rechargeable li-ion 9Vs provide 7.4Vs and NiMH 9Vs provide 8.4V which is more closer to an Alkaline 9V battery. For most cases they will work as replacement, but for medical devices it might require the exact voltage to work properly.
Thank you
There is a difference of about a whole 0.2 volt between the NiMH and Li-ion. 2x3.7 volts = 7.4 volts. While 6x1.2 volts = 7.2 volts. There's probably something in that clock that oscillates (quartz crystal or such) at a specific known frequency given a specific known voltage. And 7.2 and 7.4 volts probably produce a frequency of oscillation a bit slower than that of a true fully-charged 9v battery that is actually producing 9 actual volts.
"There is a difference of about a whole 0.2 volt between the NiMH and Li-ion. 2x3.7 volts = 7.4 volts. While 6x1.2 volts = 7.2 volts" Actually... the Li-ion has 7 cells, so... 8.4 volts, for a 1.0 volt difference. The 6-cell battery was the Alkaline.
A Ni-MH battery has small round cells inside it. Because you can't pack round cells into a rectangular space well, they have empty space. Manufacturers may also include a fusible metal strip that melts if you short circuit the battery. Then you have to destructively open it to fix.
Lithium batteries may have a boost converter inside them to reach 9V from one cell. This one is a big no no in radio. It causes massive interference like all digital crap. A pouch cell can be packed better, but the boost converter takes room and must be insulated from the cell.
I can't reach 9V with lithium. It will either be 8.4-6.4 or 12.6-9.6. Ni-MH can be added with smaller increments.
Isn't "the most popular chemistry type" stated at the outset actually Zinc-carbon or manganese dioxide?
Perhaps the two types of chargers should be polarized with a peg coming out of the charger at different locations to interface with the correct battery, preventing full insertion of the wrong chemistry and damaging the battery.
Please be aware that these cells have significant voltage drop over time or at low temperature. Therefore, even though they work well at first installation, your devices may go into "battery alert" mode to warn you of a low battery when they actually have plenty of capacity. Primary batteries do not have this issue, so your success with using rechargeables in a smoke detector may vary.
It would be good to see some discharge curves for these products (voltage vs capacity).
None of these is my battery
5:37
My battery is BT-183342
Music level is too high.
Interesting... can't find one reputable source comparing lithium-ion (rechargeable) vs lithium batteries. Also, I now have experience comparing published estimates of 9v and AA lithium batteries in smoke detectors (claims of 5 to 10 years) and know factually zero last 5 years. let alone 10 (five different type of detectors who made that claim). All are roughly 1 to 3 years. And who? Seriously who? Thought it was a good idea to chirp once a minute on a low battery. Just freaking beep every 5-10 seconds... blink a damn light. Idiots. Nothing is honestly portrayed or designed well these days. Going to try lithium-ion. Who knows. Can't trust data sheets at all. Worthless.
Hmm I had various issues w lithium 9V not many say : after months not even a year they puff inside this anyone that has used for years lithium lion pouches( which are inside the battery ) can ouff and start a small or big smoke and can even get to a heat level at charging and start some Hazards again not always will happen to everyone that doesn’t used them daily on higher drains , I would use in delicate gear , the old tech works better for safety . Is there a way to know when battery has puff to avoid this ? Not only your brand I’m talking overall other brands ( energizer also has this issue but with the old tech 🫢
Hi Charls, this might be a result of how you're storing the 9V li-ion batteries. Please try to keep in a cool dry place, the ideal temperature range is between -4F to 68F. For more information please contact our team at service@tenergy.com and they can help you find out how to tell if your 9V battery has puffed or has issues.