bad battery protection board or bad cells?

William Knox

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Joined
Jun 17, 2015
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5
Firstly I should mention that I don't really know anything technical about battery protection boards, all I know is that they help to maintain the battery in working condition.

I opened up a scooter battery, a 33V, 6.5Ah Li-Po battery for the e-Twow S2 Booster, that I deemed dead because it was putting out less than a volt of electricity. When I took a multi meter to the contacts on the battery I was surprised to see that there was 33v of current between the final leads to the board, but the board was not allowing the current through, is that how its supposed to be?

I unplugged the balancing wires and the battery outputs 33V now, the meter seems to flutter a bit in the low 30V area, Im sure this is not a good solution so I'm looking for advice.

I was hoping that somebody could help me understand whats going on here I've included pictures of the readings. I'm guessing that it could also have to do with some bad cells perhaps that's causing the board to bottleneck in the current, I'm not sure. I'm just looking for a lead on how to further approach this issue.

initial the low reading

with the balancing wires disconnected
 
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