Hi, first of all many thanks to you & other contributors to this project - it has proved invaluable for my own project of salvaging a number of these battery packs to repurpose (primarily as e-bike power packs). For fun - see my current batch below:

3 x 61462
1 x 228499
2 x 188002
1 x 180207.

All reprogrammed with the new firmware & working perfectly.

A few notes from my experiences which may help others:

1. I did initially manage to brick a few BMS boards (the ISL94208 chip) while re-programming the firmware with PicKit3. It's clear that the BMS circuitry isn't designed for an external application of VDD, particularly while in sleep mode. I've since found that the most safe and reliable method is to not connect VDD from the PicKit at all, and also to not wake-up the battery pack. The programming works fine & reliably with only VPP from the PicKit.

2. I altered the MAX_CHARGE_CELL_VOLTAGE_mV setting to 4100 in the interests of extending cell life but initially this caused a cycling error by interacting with PACK_CHARGE_NOT_COMPLETE_THRESH_mV which was also set at 4100. It might be worth a side-note that the latter should be lower than the former with a bit of margin for charging voltage rises?

3. On occasion a reprogrammed board would work fine functionally but the LED blinking patterns were really slow. It could usually be fixed by reprogramming again. I have noticed that the slow condition has the PIC Config bits set at 3FFF 3703 while the working version is 3FFC 3703.
   I think this is a PicKit application bug which sometimes sets the operating frequency config of the PIC back to default even when re-loading the same HEX file.