GATE 2026 Airstreams Renewables Complete Practice Test

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State of Charge (SOC) and State of Health (SOH) differ how?

SOC measures temperature; SOH measures voltage

SOC is the current stored energy as a percentage of capacity; SOH reflects overall condition and remaining performance relative to a new battery

SOC tells you how full the battery is right now, expressed as a percentage of its rated capacity. It’s like a fuel gauge for stored energy at that moment. SOH, on the other hand, describes the battery’s overall condition and its ability to perform relative to a new battery. It accounts for aging, degradation, and changes in maximum capacity and internal resistance over time.

So you can have a high SOC (battery appears near full) but a degraded SOH (the battery can’t deliver as much energy as a new one), or a lower SOC with decent SOH if the battery is aged but still capable. The two measures describe different things: current energy level vs overall health and remaining performance.

SOC and SOH are the same

SOC is lifetime energy; SOH is current charge state