lithium batteries

I have a 12v rated adaptor but the output voltage it is giving is 13.7v which is very high to charge a 12.6v 3s lithium battery pack. So need help to understand this circuit and how to make this circuit produce 12.6v

I'm putting together a 12V 4S3P battery system with (3) HXYP_4S_3828_BMS battery management system modules, each managing one of the three stacks. Can I safely tie the three stacks together at the 12V terminal? My concern is that there may be a slight voltage difference between the stacks. The...

Hi everyone I'm doing a little project at home and came across an issue. So I'm trying to convert my old Bose QuietComfort 15 to wireless headphones. The stock version uses a AAA alkaline battery and only has an AUX connector for the audio. I'm integrating a rechargeable battery and bluethooth...

Hello I am just a hobbyist and have some interest in electronics and have built 18650 battery packs, arduino iot projects, etc For harvesting old 18650 Lithium-Ion cells, got a Capacity tester named HW-586 (a copy of another popular ZB2L3 ). Its a simple analyzer which using power resistor load...

Hi everyone, I'm trying to build a solar powered lamp that automatically turns on when it gets dark for my grandfather. He has already purchased a small solar panel connected with micro USB to a light bulb that has to be switched on, but I wanted to automate this by connecting a photo resistive...

Hi All, This is my first post at AAC; it looks like a great place to come for advice about battery selection for my project. I'm trying to refurbish some wildlife radio transmitters. The manufacturer wants $165 to refurbish each one, when all they need is a new battery. I've not been able to...

Please I have a bunch of lithium batteries connected in parallel, each rated 3.2v and 3Ah.(about 4 of them. I have a laptop charger with an output of 19v at 2.1A. I know I can't connect it directly to the batteries, so what type of circuit can I use to charge the batteries via the laptop...