I find myself in a situation where I want to replace an old, 250mah battery in a headset with a new battery but larger capacity.

The new cell has been salvaged from a disposable (rechargable) vape and the cell is in good condition, it does not have a bms as I suspect the management circuit sits on the small pcb in the vape.

The headset battery (503020) does seem to have a small strip bms soldered on top of it.

So: old battery (lower capacity) with bms, newer battery without bms. batteries are about the same width, just length that differs. Both are the same voltage.

My question is: can I desolder the bms from the old battery and resolder it to the the new battery? Are bms spesific to a type of battery or can they be moved between different cells?

I do realise that I will need to be careful not to get the cell overheated during the process.

I have a UPS with a dead battery that’s outputting only 3 volts (two 12V batteries).
When I replace it with a working battery and turn it on, it emits a continuous beep.
When I check the voltage on the cable feeding the battery (I remove the battery beforehand), it shows around 3 volts, even when unplugged.
Interestingly, the voltage decreases when I plug it in and when I press the button.
What's the problem, and what components should I check?
No capacitors is pregnant or leaking

Hiya all … Currently using a spray pump for plants … operated with a 12volt / 7amp battery But the battery gets discharged in a couple of hours

Can I increase the spray time by replacing the battery to 12 bolts / 12 Amps (increase battery Amps from 7 to 12) ??

Will this increase the Amp Hr rating and give me longer time ??

Thanks in advance

Hey y’all, I’m trying to make my raspberry pi 5 (which needs 5V 5A currents) cordless.

I found a DC-DC 7.2V to 5V converter and a 7.2V 7.8Ah battery pack, but I can’t seem to find the right charge regulator…

I need it to charge the batteries, but also to output 5A to the converter.

I’ve finally bit the bullet and ordered up a bunch of Eneloop batteries (both white and black versions). I’m now searching for durable/reliable chargers with built in testing.

I need a god quality wall charger for fast charging at home during normal conditions but my primary use cases for these batteries are backpacking, hunting and blackouts. In these scenarios I don’t have the option to use a wall charger and would like to recharge batteries from a battery bank via usb-c.

What are my best options for both a standard wall charger and a more portable charging method?

Appreciate any input.

Hello I have Samsung A14 and an A15. Neither came with a charger. I have 3 older Samsung changers. 5v 1.55a, 5v 2.0a and an 5.3v 2.0a. I don't care about fast charging. Only.what is safe for the phones.battery. Are these older chargers safe to keep using or will they harm the long term battery life?

If i short circuit each of them with my fingers how much time it takes to drain them ? Does it actually drain ?

Sorry for my English

My lifepo4 is charging rapidly, It stay in 3.24v then when i charging it, it fully charge in like 10 minutes,then it stay in.. and it quickly discharge when im connect the load until it reach 3.24v per cell, then it back to normal

But the internal resistance of the battery is good

I never use it because im already bought it last day,

My charger is buck converter and laptop charger, it is possible the the buck converter and laptop charger are the reason?

Im already top balance the cell but it also quickly charge to 3.60v then the buck converter cut off the current

Sorry fo my english

Need some help with my car battery.

It keeps going flat all of sudden, so I’ve been suggested to get a battery charger, it only charged for like 1 hour and said 100% full with the voltage at like 13.4v which settled to about 12.7v after sometime. However the battery percentage reading on the charger does not go past 40% and slowly creeps to around 34%. The voltage holds at 12.7v but I believe the issue I have is my battery is treating the 34% as full. How can I fix my battery as it’s only 1 year old.

I know I can claim through warranty but I have to send it out, wait for them to test and then wait for another one which also costs me. If I can fix it myself then i would prefer that, and if I need to buy a cheap tool, then I also gain a tool that will be never used again lol.

Bosh S5 005

Hey all,

I bought some Maxell ML2032 batteries and they don't seem to be holding charge-- I'm thinking they just came completely dead so went to look for a ML2032 charger... all of the chargers seem to charge at 3.7V -4.2V, but everything I read says ML2032 should not be charged higher than 3.3V.

Is it safe to use one of these chargers that have the higher voltage? Can anyone recommend a good source for a charger that won't ruin ML2032 batteries?

Right now I am trying to calculate the power dissipated by a battery pack to resistive losses from a recorded current draw. Would it be correct to calculate this using P=RI^2?

I have another person telling me that that is wrong and that you have to calculate the power output of the pack and then find what the current would be with zero voltage drop on the pack under load. And then use P=RI^2.

When I do it the second time I get a plot that shows significantly lower power draw but to me this doesn’t make any sense.

Not sure where to go for help with this. I recently replaced a robotic lawn mower battery with the following equivalent battery: https://www.interlightus.com/products/cub-cudet-bat6001b-battery.html

Rating: 25.6VDC, 6000mAh / 153.60Wh

Model No: CS-RRS630VX Cameron Sino Battery

Part No: BAT6000A, BAT 6000C, MRK6103A

The lawn mower runs fine manually, but often gets stuck on a "special charging mode" as defined here. It charges it to 100% fine though.

Battery cells are being balanced in special charging mode

Is there another charger, or something I could potentially plug it into similiar to something like a Noco 12V charger

that might put it in a better state for the mower to be happy with? I feel like customer service is not going to have any idea especially since this particular mower is older than their latest.

Has anyone or even can you replace the lithium cells in an anti gravity battery? I have a 401 that doesn’t work anymore and have some old lithium battery cells from some drill batteries laying around and would rather just use what I got

I waa setting up a tool presetter only to know that the machine didn't run for 10 years, so I tested the volt and got no voltage on it. It's with a 676 coin battery on top.

What is the voltage, watt etc. I can't find any information about this pack of batteries. It supports the data, when the power goes off the machine.

I bought some 32700 cells from a local shop. They all are same Brand, Capacity and Manufactured on same date too. But they have different numbers printed on the bottom like H8 / H7 / H5 / 0

Does anyone know the meaning of these numbers?

https://preview.redd.it/2866hm64qxtd1.jpg?width=900&format=pjpg&auto=webp&s=1dd77dfc9872337482d12bff33ff307c04961dc0

https://preview.redd.it/48iqkn64qxtd1.jpg?width=900&format=pjpg&auto=webp&s=bd7b8ea3b0264e9028775055d44de5cff25a7603

Hi, I both it on Amazon during Prime days. It’s new, received today. However it looks like it stayed in stock for 15months before opening it today.

Is the battery affected by such shelf life? Battery is 7.68V 38wh.

Battery is key being used for school.

Thanks

UPDATE: The battery was at 27% when started

Hey all,

So following on from my last post about this battery situation. I could do with some help if possible.

I have searched far and wide for a replacement that ships to the UK or even a alternative battery to work with this camera. Its takes the BP-4XX line but I did find this listing of a BP-808 that states that its similar to the BP-422 ---- This link same voltage and says its similar to the BP-422, seems like it would fit as well

I also contacted some re-celling companies but they havent got back to me

I'm at a loss here and unsure what to do to bring life to this camera!

Any help would be great, thank you