charge

"This schematic is for a lead-acid battery charger circuit. I've set up this circuit, but it's only charging at about 15 milliamps. Can anyone help me troubleshoot this problem? By the way, all component values are according to the schematic, except I used a 13-volt transformer instead of a...

This is my friend's battery pack and I wanted to surprise him by making a homeade charger. How would i go about that? Is it possible? Is it expensive? I have basic soldering skills. Thanks so much.

YouTube video with the sound What is this sound, and why does it happen? After discharging the motherboard (turning it on without a power source), and then powering it with a battery, it makes that high pitched noise (before the buzzer beep). Is it the capacitors charging? It makes the same...

I have a tp4056 li battery charger and I ordered a 440 mah lipo battery. Is it OK to chare battery with this or will be the current too much for battery? Do I need to modify module?

Hi guys, I am new here. FYI before I get started, I am not an engineer, designer, programmer, or anything of that nature. I’m just a dude who loves a challenge, and I love diy home projects. Now, I hope this is the right forum to ask this kind of question! So let me get started: I have lately...

I have a Braun oral-b pro 2000 toothbrush and with the original battery it now only lasts about 1 minute. I replaced the original 3757 Ni-MH battery with an AA size Ni-MH (higher capacity) battery and the red “battery low” indicator blinking. I had put it on the charger and it charged the...

Hello, I am currently re-purposing my old powerbank for a robotics project (BMS and LiPo will be integrated into a 3D printed case). The Powerbank (CellularLine FreePower Slim 5000) was unused for 7-8 months and while opening It, I measured the cell voltage, which turned out to be ~0.7 V...

Hello, I want to design a battery simulator circuit to test my board. My board connects to a single cell li-on battery, 3.8V 2400mAH and it has a wireless charger circuit with up to 400mAH charge. The battery simulator needs to provide up to 1A to the board and to be "charged" at 400mA. I've...

Hello guys. I have a JBL Charge 2+, and i got it as a gift. It has no battery inside, but googled that i can turn it on without the battery by just plugging the charger in. I did that but the speaker does not respond at all, and all it shows is a white power button LED, and thats all. When i...