I have two SOK 206ah batteries and I am new to this so I may be misunderstanding something.
Battery 1 "shuts down/sleeps" at around 10.3 volts. It then shows very close to 0 volts. At this point I need to "wake up" the battery using my power supply. After a few moments I can then start charging with my Aims Charger. This battery appears to be working as it should.
Battery 2 never shuts down, at least as far as I am willing to take it. The battery keeps discharging into a 12 volt bulb and I manually stopped it at 9.4 volts. I have included below a photo of my Renogy meter below showing the voltage, discharge current, etc. I confirmed this voltage (9.4v) with my multimeter.
It sounds like to me that this battery has a defective BMS, as it will not put the battery to sleep at the correct voltage.
I still had to use my power supply to bring the battery back up to around 10.3 volts and then the Aims charger started charging.
I do understand that that the BMS should not be the "catch all" as far as shutting down the power out, but I would think that at least this would be another step to assist in not allowing the battery to discharge into dangerous territory!
Any assistance in this matter would be greatly appreciated.