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What specifically was the problem? Just telling us not to buy from them isn't really enough to make an informed buying decision.
 
The high price for one. I could build that same pack for less, without having Chinese labor involved.
 
It could be some bad welds that have come off the Cells which are causing the BMS to misbehave.

The only sure way is to open the pack and measure each cell row directly and via the balance wires for any inconsistencies.
Also, inspect the welds.


If you don't want to risk it or whatever I wouldn't mind taking a look at it for you if you are willing. I also have a few 20S BMS.
 
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