Hey all, a while ago I got a new 24v 10ah LifePo4 battery from Golden Motor. I was surprised to find when charging it, the charging cut off abruptly at 27.1v. Other LifePo4s I have usually charge to 3.65v per cell, which means this battery should charge to 29.2v (which is also the output of the charger I'm using which works as expected on other 24v packs). I also noted, after testing, that the capacity was quite a bit lower than advertised (~200wh vs expected 240, but my meter could be off). The pack wasn't getting hot - no excessive voltage drop- the problem to me seemed like cell imbalance. I recently had on an older LifePo4 pack which had a similar early cutoff issue. I ended up fixing it by hooking it up to a small solar panel + controller for a few days, thinking that the daily slow charge / nighttime settling cycle might allow the BMS to balance. It did. From that point on it charged up fully again. So for this one I tried to do something similar but without solar - I simply got a DC converter with CC/CV, dialed it to 29.2v, and dialed the current all the way down (15w is about as low as it would go). Unfortunately, I've been unable to get the pack to go even a smidgen beyond 27.1v. It just rises at a constant rate and then instantly cuts. So I'm just confused at this point- what is going on in there? My technical understanding is that, if this is a typical passive balancing BMS, if a cell group went above 3.6v ish (standard LifePo4 balance voltage - maybe they custom set this somehow?) the BMS should start bleeding that group. That bleeding is slow though, so in theory, if a group was too much higher than the others, then during charging, that group's voltage could still rise above a safe limit, and thus the BMS would force all charging to stop abruptly. The lost total voltage and capacity would be from the other groups which didn't get a chance to fully charge before cut off. That's the only explanation I see. But if so, slower charging a few times should at least begin to correct this, no? Charging closer to the bleed rate would allow time for those high groups to bleed down and the low ones to catch up, before one trips over the limit. But it's just not happening. So, anyone have any ideas on what's up with this battery? I should mention I've had it a few months now and it does seem like a decent battery- this just bothers me. And also, I tried taking this issue to Golden Motor and they just had no idea what I was talking about. So here I am. Thanks for reading.