I have 6 - SK12V206H that I purchased in the last month. All the batteries showed up with 0% SOC on the BMS app, so I charged 5 up to 100% SOC, BMS cutoff, C-MOS to off. The 6th battery only went to 85% and then quit charging, no current flow, and 14.63 for voltage, maybe it was balancing? I could not tell. So I disconnected the battery and let it rest, yet 48 HOURS LATER, THE VOLTAGE IS STILL 14.12 volts! The other 5 batteries dropped down to 13.7 volts or so in a lot shorter time...
Could I have a problem cell? Should I try and charge again to 100%? Should I discharge instead? Is there anybody else that has seen this?
Maybe it isnt a problem at all, but this battery has not acted the same as the other 5, not sure what is different but I really do NOT want to screw up the batteries, they are NOT inexpensive as 2e all know...
Any ideas are appreciated, trying to contact tech help too
thanks
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I fully discharged battery, manually stopped discharge (3-4 amps) at 10.2 volts because BMS did NOT. Charged battery back up with Victron 30amp smart charger, went to 100 % this time! Now discharging 2nd time to 0%, but will keep watch on voltage, now knowing BMS did NOT shut down and will stop discharge at 10.5 volts, what the BMS is "supposed" to do. Then I will charge to 100% for second full charge and then discharge 2nd time, and the SOC should be calibrated. After that I do NOT ever plan to discharge to 0% or charge to 100% regularly. My system should never discharge very low unless there is a big problem, I will use very little in the summer, as my 4.4kw solar system with 1480 amp hours FLA, L-16RE-B, Trojan batteries is floating by noon on a sunny summer day. Will update...
fully discharge this battery separately and then have a check