It is not safe to short the battery output ever, for any reason. Not even once.
The BMS had probably been trying to protect you against some problem with the bike (overcurrent, problematic cell, etc.). You may still be able to troubleshoot the bike to find the problem it was protecting you from, but your best indicator of it's existence and whether or not it's fixed is now gone, probably permanently:
Shorting the output probably blew up the BMS discharge FETs that were protecting the battery from the problem (which usually causes them to fail in a stuck-on state). If so, now the BMS won't be able to protect the battery against any future problems, like overdischarge, overcurrent, etc., leaving the battery vulnerable to damage that could cause a fire at some future point.
I'd recommend taking the battery to a qualified repair facility near you to be tested for this problem, and replacing the BMS if it was indeed destroyed by your action.
I would strongly recommend against you opening it up at all for any reason.
If this is the same pack from this thread:
https://endless-sphere.com/forums/viewtopic.php?f=3&t=115410
it probably has other damage from being left in the rain and from being charged at 2c (which being a 6p pack probably means more than 25 to 30 amps, way way way more than even an undamaged pack could handle), and would be much safer to replace it entirely before you have a fire.
bike4life said:
i have this volimart kit ebike.
image.jpeg
Has one of these throttles. The ebike will not turn on or move, the controller throttle led is last bar - orange or sometimes nothing.
I measure 54v at the battery. I could not get the bike to run or the throttle display to turn the bike. I was able to get the motor to humm a bit but nothing else. What confused me is if the battery is dead, why can i read 54v.
I decided to temporarily for a split second short the battery power leads with a key on my keychain. this created a big spark and spot welded a little drop of copper to my keys.
Upon doing this, the ebike battery still reads 54v but the ebike runs and the throttle display shows full 3 bars.
why is this happening and is it safe to do this like once a day or something with the key to get it to work???????
is it a bad connection? bad bms ? bad controller ?