Battery Cycle Standards: SOH, DOD, and EOL Explained with
Frequently Asked Questions (FAQ) Q1: What is SOH on my spec sheet? SOH is your battery''s health compared to new. A new battery is 100% SOH.
Battery SOH is typically expressed as a percentage: 100% indicates a brand-new condition, while lower values signal deterioration. Cylindrical battery pack composed of individual cells, where each cell's condition impacts the battery's overall State of Health (SOH) Temperature: Extreme temperatures accelerate battery aging.
SOH is your battery's health compared to new. A new battery is 100% SOH. Q2: Why does my supplier show different cycle numbers for the same capacity? They tested under different standards — SOH, DOD, or EOL.
Definition: Battery SoC (State of Charge) means how much charge remains, like a fuel gauge. Measurement: Common methods include voltage check, coulomb counting, and impedance spectroscopy. Optimal Range: Keeping SoC between 20%–80% prevents stress and extends battery lifespan.
Depth of Discharge (DoD) is another way to represent the state of charge, focusing on the percentage of the battery's capacity that has been discharged. It is calculated as: DoD (%) = 100 – SoC (%) Several factors can influence a battery's SoC:
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