Knowledge Hub · Electric vehicles · Battery · 5 min read

Understanding EV battery health before you buy used

How to read state-of-health reports and what degradation actually means for your daily drive.

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A used EV is a battery with a car around it. Ask for a state-of-health (SOH) report: many brands show it in the car’s menu, dealers can pull it with a scan tool, and third-party services produce one from a charge-cycle test. Expect 2–3% loss a year early on, slowing later; a 4-year-old car at 88–92% is normal, under 80% deserves a price cut or a pass.

Also check: the battery warranty transfer (usually 8 years/100k miles to 70% capacity), DC fast-charge history (heavy fast charging ages packs faster), and whether any battery modules were replaced. Then do the real-world test: charge to 100%, note the estimated range, drive your commute, and compare.

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