State of health is how much capacity the battery has left compared with when it was new, as a percentage. All lithium-ion batteries lose some capacity with age and use, and heat and frequent fast charging speed this up. Battery warranties are written against this number: Kia, for example, covers a pack that falls below 70%.
Ask for a battery health report when buying a used EV.
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Checked against this source on 18 Sep 2026. Every term