XR Error 21 (repaired)
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@lemur Aha when in doubt that's not a bad shot.
That sounds like the balancing is working, just a bank is out far enough it's going to have to do a few more balance cycles to get them in line.
I have in the past taken batteries and charged cell banks manually in 1S through the balance lead. Super jank but it beats waiting for these infuriatingly slow balance charging circuits to level a massive pack. -
@lia I did the bms test with a known good battery with and each cell was at 4.00 volts. Only one bms reported correct voltages with Owce, the other two bms reported a low and high cell, the worst being 3.96-4.10 volts.
That means not all bms's report the correct cell voltages according to the Owce app.
I repeated the experiment to verify the results. -
@lemur Oh it's different on that one. I thought you meant it was just balancing slow.
That is very weird. I wonder if there is a corroded link on that BMS or a failing resistor that's creating a larger voltage drop by the time it gets to the bit that reads the voltages.When I made my battery pack from spring loaded contacts the first time (and then gave up and welded them) the voltage drop was insane. Might be something similar be it contact resistance on the port or some biffed trace/ component.
