How to Fix the Slow Charging?

[sunshine_eggo]

It was less of a "I'm worried about 3.75v in particular" situation and more of a "why didn't protection re-engage when it hit 3.65v again?". Shouldn't it re-protect at 3.65v?

It was still poked full. There was negligible capacity lost in the fall from 3.65 to 3.50. Protection actions have an associated timing. Given that the cell was completely full, the applied current induced 3.75V before the clamping triggered at 3.65V arrested it. Watch any BMS like a hawk, and you'll see similar behavior.

 

[WearyWanderer]

Now we're cooking with gas! Connected my new PM3-100LK directly to the bus bars via 1.5ft 4ga pure copper cable , and it's pushing the 100 amps no issue. I'll probably switch to some nicer 2ga cable I have with factory-crimped ends, but right now, things are working great!

Thanks everyone for your help!!