2.12 Volts per cell is 100% charged, 1.75 VPC is 80% discharged. If you have a 36 volt battery times your VPC by 18, if it is a 24v battery times your VPC by 12. 2.12 VPC assumes your battery is perfect, 2.08 VPC may be more realistic. How is the battery being charged and discharged?
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