shorted the charge port on a Juiced G2 battery and now the charge port reads zero volts

[narsino]

the battery powers up and the discharge port reads 53 volts. i opened up both ends of the battery, but i can't find a fuse for the charging circuit.

any help will be appreciated. thanks!

 

[Diggs]

Your BMS disconnected. Have you applied a charge to it? Usually this will reset the BMS.

 

[narsino]

hello Diggs! thank you for helping a stranger out.

i have a 2 amp charger from the old battery. i have noticed that i don't have any voltage across it when nothing is connected to it. i did notice that it seems to pulse an increasing voltage. i tried plugging it in, but only for a brief moment. i will try it again today. please let me know if this rings any bells. thanks again!

 

[narsino]

friend Diggs, so i tried charging it with the charger and monitored the voltage. it won't go over 0.03 volts while pulsing as mentioned above. basically it looks like an open circuit to the charger.

now, i have a voltage source that i can hook up to the charging port, and gently increase the voltage while current limiting. is that recommended? or should i just get in there and see what is going on with the BMS board. maybe replace it.

thanks!

 

[Diggs]

now, i have a voltage source that i can hook up to the charging port, and gently increase the voltage while current limiting. is that recommended? or should i just get in there and see what is going on with the BMS board. maybe replace it.

You never stated what nominal voltage this pack is supposed to be (48/52/60). Yes, you could probably try to force a reset of the BMS with increased voltage/amps (sounds like something I'd try) but that's getting beyond my knowledge. Magic Smoke is never too far away when doing that kind of procedure. Opening it up allows you to verify cell voltages and BMS output during charging (if at all) but again, there are others that can better guide you.

 

[narsino]

thanks for your willingness to help! i found the culprit. they did have a fuse on the charging circuit. it seems like a custom fuse and now i have to find out which one it is. until the next time!