I never feel bad in good conversations, you've been great!
In general though, the JK BMS should not be presenting '0% left!' when the well-matched cells (known by a JK setting to be LiFePO4) have been designated as '230Ah', and the downward drift occurs with no external discharge at all (from an even higher SOC when taken from the test bench). When removed from the test bench and first taken to the RV trailer for wire-up and testing of high RV loads, when JK showed only 6% left. The genuine remaining capacity at that moment was over 97% - and when cell voltages are that high, the SOC versus Voltage curve has fairly high slope, allowing Voltage alone top provide a good SOC figure for rested LFP cells. In initial top balance, testing down to 12v and calculating the remainder, 3 of 4 cells exceeded 230Ah, and the "weak" came in at 229.Even before doing any discharge work at all, the JK App was showing "6% left" in the pack - sitting on the test bench at a high SOC. The only value my further discharging the battery pack in Trailer testing (down to around 70%) WRT this issue was the confirmation that JK (thank goodness) does not use a ZERO value to shut down discharge of the battery pack. It at least allowed the pack to continue supplying discharge current. But the defect is present and profound - if the new JK (and its cellphone App) can't be fixed to show SOC with moderately decent accuracy in the App, I recommend that the figures should NOT be shown by the App at all.
