SOC & SOH
State of Charge is the current charge level in percent; State of Health is the remaining capacity relative to new.
State of Charge (SOC) is how full the battery is at this moment, expressed as a percentage of the usable capacity, comparable to a fuel gauge. State of Health (SOH) is something else: that is the remaining capacity or condition of the battery relative to factory-new, also in percent. A car can have 100 percent SOC while the SOH is, for example, 92 percent.
SOC determines the immediate driving range and the charging behaviour: fast charging is fastest at low SOC and throttles above about 80 percent. SOH says something about ageing and is relevant on a used car; it is estimated by the battery management system and the measurement method differs per brand, so individual readout values are not one-to-one comparable between models.
We use these concepts to keep charging behaviour and degradation apart. An SOH figure of a specific vehicle is an estimate by the system, not a measurement verified by us; we show it only with that caveat.
See also: Battery degradation, Charging curve, Charging power (AC/DC), Drivetrain & battery warranty
Source: Concept explanation; SOH is a system estimate, method differs per brand
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