I also have 4 of the 100 Ah LFP batteries (with Bluetooth) from WattCycle, I have had a problem with one. It disconnected itself (may have been my fault) and would not take a charge or show any voltage across the terminals. The Bluetooth app showed crazy cell voltages from 3.2V to negative 0.8V.
I researched and found some people had good luck disconnecting and re-connecting the internal BMS so that is what I wound up doing and it cured my problem and showed cell voltages nearly identical, and also nearly full. No issues since.
Why I say it may have been my fault is because I had left this one battery connected to a 2500 watt 12V inverter (12" long 8ga wire) in the front floorboard of my truck. I had been using this as a portable 110v power supply for a 7 ¼" circular saw. I had left it connected so I wouldn't have to use a resistor to reconnect it when I needed it again. But the next week when I went to use it, the inverter power switch was on but no lights or output from the inverter. I guess the switch got turned on while bouncing around and I thought my only issue was a discharged battery but it was the BMS issue above. It was easily fixable but I prefer things that don't break, as opposed to something that has a good warranty or is easily fixible when it does break.
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