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Practical methods to assess battery degradation and remaining capacity on used electric vehicles.
Battery health is the most critical factor in determining the value and usability of a used electric vehicle. Unlike a gas engine that might show obvious signs of wear through noise, smoke, or leaks, a degraded EV battery can look perfectly normal from the outside while delivering significantly reduced range. This guide teaches you how to accurately assess battery health before making a purchase. Battery health is not one number; it is a pattern of evidence. Start with the vehicle displayed range at a known state of charge, then compare it with the original EPA range, current weather, wheel size, recent driving efficiency, and whether the battery is warm or cold. Displayed range can be optimistic or conservative depending on software, so use it as a screening tool rather than as proof of capacity. Ask for any manufacturer battery report or service invoice that lists state of health, usable capacity, or high voltage diagnostic codes. Some brands expose battery health estimates in service menus or owner apps, while others require dealer equipment. Third party OBD tools and apps can be helpful, but readings vary by vehicle platform and software version. A good inspection note should…