If this 91% is what the charge percentage is showing on the dash, then it seems to match pretty closely to the SOC that the Alpha OBD log is reporting (91.76%). So at least at high SOC things look okay. It would be good to get another log at a low SOC - especially if you are only getting 50 to 60 miles out of a full charge. At the low SOC, those failed cells may indicate what is going on. It will also verify if your calibration is still good at low SOC.I took two, this one was @ 91%. It was 96% at home but it took it whil at my office a couple of miles away.