Recent content by Hot Toddy

Thanks for the clarifications. I will be current limiting to 4A (2A per pack). The max voltage differential between the packs is unlikely to exceed 20V. So will go with Schottky diodes that can handle 40W and increase the charger voltage to account for the (~0.3V) drop across the diode...

Great feedback guys. Thanks. So, in summary, it should be fine to charge both at the time from the same charger provided I have a suitable diode across each battery pack charge connection to prevent the risk of any “back charging” from higher pack voltage to the lower voltage pack. So just need...

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...

Thanks for the replies. Makes perfect sense as the BMS is typically built into the pack and never seen again. So no point adding the manufacturing cost to add them.

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...

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...