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  1. H

    Charging two batteries off a single charger OK?

    Hi, I have built two identical 13S5P lithium ion battery packs (same cells, same BMS) to power mine and the wife's ebikes. I have also built a CC/CV charger, capable of delivering up to 10A at 60V, which I aim to generally run at 2A (per pack) at 53.3V (max cell voltage 4.1V) to maximise cell...
  2. H

    BMS balance circuit LEDs?

    I’m testing a 13S5P 18650 li-ion pack I’ve built to confirm the balance charge function. I’ve removed the backing fish paper from the BMS board to expose the balance circuitry In order to (hopefully) monitor the balancing of each cell group as they reach their cut-off voltage of 4.25v before...
  3. H

    Spot weld cell puncture - how 'catastrophic' is this?

    Hi guys, I'd appreciate your wealth of experience on this one ... I'm building a 13S5P li-ion ebike pack using a DIY spot welder built from a car battery (630A cold start), 500A solenoid switch, and digital timer (10ms resolution running at 80ms bursts). Having completed welding the first side...
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