Industry jargon

State of charge

Also called: SoC, SOC State of charge is an estimate of how much usable charge remains in a battery, normally expressed as a percentage of the available capacity. It performs the same practical job as a fuel gauge in a combustion vehicle. SoC is estimated by the battery-management system from measurements and models rather than measured directly as a simple liquid level. Voltage, current, temperature and battery history can all contribute to the estimate. Charging power often changes with SoC. Many EVs accept their highest DC charging power in part of the lower or middle SoC range and reduce power as the battery approaches full charge.