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Have seen these panasonic cell packs advertised https://www.amazon.de/Akkupack-Panasonic-NCR18650PF-Lithium-Ion-Entladestrom/dp/B01KNXAPLC . They look good quality and pre-welded but i would need to fit a BMS, which is just soldering work. I can re-use the BMS off the old battery but might want...

thx d8veh, This worked. Battery and bms now working normal. I used a mobile phone charger for a 5v charge on the one cell. I then had to initially bypass the bms and charge the whole battery with the 42v charger until the battery voltage increased to 39v then the bms jumped back into life.

Battery Diagnosis, Repair or Buy I've had a similar problem. Battery power suddenly stopped mid journey during a rainy day. I can't start the recharge. Maybe a short circuit? Battery is a Lishen 36V 10ah,15 months old, light to moderate use. See photos. The static cell readings are: 3.2...