Submitted 1 week ago by ColdWater@lemmy.ca to askelectronics@discuss.tchncs.de
https://lemmy.ca/pictrs/image/873965b9-fdc4-4663-ad5d-b69d452877e8.jpeg
Props for having the guts to take a lithium battery apart so you could wire the usb cable to the bms.
I guess it’s sort of safe in that the bms would shut itself down if the voltage is too high because it thinks the battery is overcharged, but I still wouldn’t recommend using it in this config as I’m sure the usb port can’t provide the same amount of current as the original phone battery, so the phone might shut down.
I’m not planning to use it for real since I didn’t trust it myself and thanks for the link I’ll have to try it out later
It seems to be working, but the phone is expecting a 4.2V or 4.35V max input and USB is 5V. Maybe that power bank has a lot of voltage drop or a poorly regulated output so the voltage is lower.
this powerbank can output varied output (4.5v - 12v) and it’s a fairly high quality powerbank
Along with your comment it looks like you are powering a phone with a power bank by skipping the phones battery and connecting directly to the phones battery terminal?
5V may be too high of a voltage for your phone as the phones lithium battery would have otherwise provided 4.2v ish but youll need to find out.
If you directly connect to the charge controller input does it still work or does it complain that there’s no battery?
breakcore@discuss.tchncs.de 1 week ago
If you would like some feedback in whatever is going on there, please explain what the problem is and what you want to know.
ColdWater@lemmy.ca 1 week ago
I connect powerpack to the battery terminal
quiescentcurrent@discuss.tchncs.de 1 week ago
Then this is not safe.
The maximum charge voltage for a lithium cell is 4.2V while USB will provide 5V. It may work for a while, it may fail in a safe state or something gets hot and burns.