I have an old backfire G2 spare battery (no name chinese cells 10s2p) that was laying on the shelf for a few years (+/- 3.5years), and i decided to try and build something with it.
Miraculously the pack does not seem dead yet (still at 36V and the p groups are well balanced), but for some reason i can’t get it to power my esc (maker-x go foc dual).
When i read the voltage before the bms i get 36V, but i get a really low voltage (+/-0.3V) on the main connector, after the bms.
Does anyone has experience with this kind of chinese bms ? Is there some kind of safety handshake between the bms and the esc to get it to deliver power ? I know boosted used to do this, so maybe it’s the same here or maybe the bms is just dead.
I’m not finding anything, kind of surprising considering how many of these they sold. Can you replace a BMS? There’s lots of info on “waking” sleeping lithium cells, but I couldn’t find much on BMS’s. I think you might need something like an FTDI programmer, but it could be more simple than that. Try the other question threads, perhaps.
You want to find the smallest ones of course. You want to label each balance lead you cut with the voltage you measure from it: 1 - 10. Then there will be one, I think, additional wire- ground. How many balance leads can you count? I think sometimes there’s an additional 12th wire on 10s BMS’s, and it would just go to the positive battery terminal.
It will be easy to figure out which voltage is what series because it will be sequential, of course.