BMS AP9921X-AP9922; alarms “Battery Cell Shorted”
Battery Management System (BMS) AP9921X-AP9922
All models, all serial numbers
The sum voltage of the indicated battery is below normal, usually by more than the voltage of one cell. The alarm value is calculated using the following formula: ((#Cells/Batt)-1) x (Vstring) (#Cells/Batt) x (#Batt/String) Example: A normally float-charged 12-V VRLA battery measures 13.5 V at 2.25 Volts per Cell (VPC). If the voltage falls below 11.25 V (2.25 VPC x 5 cells), but is still above 0.5 V, the battery activates the Battery Cell Shorted alarm.
Check the voltage reading of the indicated battery. If the alarm is accurate, replace the battery immediately.