Does average battery degradation per year predict next year’s loss?
A used EV has lost some capacity over several years. Is dividing that loss by its age a useful way to forecast the remaining life of the battery?
EVVerity explains
A closer look
An average describes the past
A hypothetical 8% capacity difference over four years averages 2 percentage points of original capacity per year. That is a summary of the chosen endpoints. It does not establish that the pack lost the same amount in each year or that another 2 points will disappear next year.
Do not turn it into a failure countdown
Extending a straight line until it reaches zero creates a prediction unsupported by those two readings. Battery condition, operating history and measurement changes can affect the pattern. Compare consistent repeat measurements and actual vehicle requirements rather than assigning a replacement year from arithmetic alone.
About this editorial content
Prepared with AI assistance for EVVerity. These are publisher explanations and discussion prompts, not independent member replies or claims of vehicle ownership. Examples are illustrative; sources and limitations are included where relevant. Read our editorial approach.
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