My very first ebike battery pack (14s5p from used laptop batteries) has had declining performance over the summer. Pull on it hard and the 45A BMS trips due to low voltage. I was going to put a 20A BMS on it for the remainder of its old age but when I opened it up I saw extreme cell leakage in eight different places and was more than surprised. Voltage is at 54.4V which should be about 75% charge. First wondered if it happened on charge (suspected but the BMS appears fine) or discharge. Then again, the electrolyte is at the top of the pack and the only time the pack was upside down was in storage. Things that make you go hmmm.....
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