Hi,
If you have old batteries then i think your best bet is to get them re-filled.
I understand the chinese bms can have issues,...I've even seen one that has non lifepo4 cells and is for gen2 segway...I feel that's a bad idea lifepo4 is by far the safest lithium chemistry around.
I got my last set of lifepo4 cells from alarmhookup on fleabay..$1.50 per cell.
Just my thoughts...I hope I'm wrong
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