Battery degradation
The gradual capacity loss of an EV battery over time and use; usually a few percent per year, non-linear.
Battery degradation is the gradual decline of the usable capacity of a drive battery through ageing (calendar degradation) and use (cyclic degradation). The visible result is a slowly shrinking range. The course is non-linear: often a somewhat faster drop in the first year, then a flatter line.
Fleet data and owner reports point roughly to a few percent capacity loss per year under normal use, with a large spread. A lot of fast charging, routinely charging to 100 percent, standing full or empty for long periods and high temperatures speed it up; moderate charging behaviour slows it. Figures are indicative and depend on chemistry, thermal management and use; for newer battery types the data series is short.
Degradation is something other than a defect: see the battery warranty, which usually guarantees a capacity threshold (often around 70 percent) over a term. Normal degradation above that threshold usually falls outside warranty. We show degradation pictures only with source and reference date and only with enough data.
See also: SOC & SOH, Drivetrain & battery warranty, Range, Residual-value curve
Source: Fleet data/owner reporting; indicative, depends on chemistry and use
No tax or financial advice. Every figure shows its source and reference date. Always compare with an independent adviser and the official source.