So I was noticing on high discharge (70A or more) for extended periods (like cold start) that bank #8 was lower voltage than the rest by about 0.30v when drooping down below 195v, and that at idle voltage difference was averaging around 0.12v when it was 0.03v only a few months ago. I have discharged the pack before manually and trickle charged it up at 350ma, but it's a time consuming process...so I thought before I go that route again, I'd try it quick and dirty. With the Dr. Prius app monitoring, basically the procedure was to get the battery down to 40% (put in reverse, headlights on, A/C full blast), and then shift over to neutral and let it drain till bank #8 got to 13.8v (DO NOT GO BELOW THIS VOLTAGE, IT CAN KILL THE CELLS!!!)...then turn the car off and back on (to clear red triangle), and quick charge the pack using the hold the brake down in D while flooring it trick to charge up to 86%, or whenever the generator kicks off and the BMS starts trying to discharge in Dr. Prius and then shut the car off immediately. IF when you turn the car back on to accessory mode (I check in 15min intervals to see if I need to run the battery fan if temps climb past 90F) you see in Dr. Prius that its charging (0.03A or so) instead of discharging, it's a sign that voltage is bleeding off to weaker modules. I ran this quick and dirty rapid discharge/charge cycle 4 times over the course of the week when it was convenient, and not only did the weak bank #8 level out to around 0.08v-0.10v difference during sub 200v droop, idle voltage bank difference is now 0.02v, AND the discharge and charge amps are WAY higher during normal driving. Before the quick and dirty cycles highest discharge stabbing 50% throttle was around 60-70A now its 90-110A, highest regen was 65-70A but usually below 40A, now its close to 90A with most braking around 65A...even extremely light braking charges at 45A, so if I'm at 45-50mph I can just glide to a stoplight just barely touching the brakes and get back to 67% charge consistently. MPG is also up a couple in my short distance city driving.
