Ok, so I charged my battery last night until the power supply output was down to around 50ma and the voltage meter on my board showed 42v, then immediately shut off and disconnected he bms to check cell voltages.
- 4.198
- 4.202
- 4.204
- 4.205
- 4.204
- 4.205
- 4.204
- 4.205
- 4.204
- 4.205 So then I plugged the bms back in and went to bed. Today when I got home from work, I turned the bms on for a few minutes and the total pack voltage was at 41.9v I turned the bms off and disconnected it to check cell voltages again and:
- 4.195
- 4.195
- 4.200
- 4.200
- 4.200
- 4.200
- 4.200
- 4.200
- 4.200
- 4.200 So it appears that the bms with its low balancing current needs ample time to balance the pack once its fully charged. I would have liked to leave it on the charger longer to see if it would balance while charging the low cells but it got too late and I work the early shift. It also appears that one of my packs may be a little slow though 5ma difference isn’t bad Imo. I have it back on the charger now receiving 42v at currently 50ma to see if the low cells will balance up and wondering if the 4.2v cells will hold. I will update on that later. Update: So I left the pack on trickle charge (50ma) for about 2 hours and now the low cells (1and2) are at a full 4.2v And now it’s time to go ride… P.S. I think the extra 2 hours of trickle charge is totally unnecessary. Simply charging down to 50ma the first time would have been plenty good enough.