Tesla Battery Degradation Calculator

Fleet data shows degradation is front-loaded: expect roughly 3-5% in the first couple of years, then a plateau near 1% per year. Tesla's own fleet average is about 15% total loss at 200,000 miles.

Yes. Tesla warrants at least 70% capacity retention for 8 years, with a mileage cap of 100k (Model 3 RWD/SR), 120k (3/Y Long Range and Performance) or 150k miles (S/X, Cybertruck). Below 70% inside that window, the pack qualifies for repair or replacement. Exception: Model S/X delivered before February 2020 have an 8-year, unlimited-mile battery warranty that does not include the 70% retention guarantee.

Less than commonly believed. Recurrent's study of thousands of Teslas found only a small retention difference between frequent and rare fast-charging. Heat and sustained high state of charge matter more. This calculator models frequent DC fast charging as a mild penalty.

Nickel packs (Long Range and Performance) age faster when held at high charge, so 60-80% daily is the standard advice. LFP packs (Standard Range and RWD since about 2021) are designed to be charged to 100% regularly, per Tesla's own guidance.

The Cybertruck (and some 2023 Austin-built Model Y) uses Tesla's 4680 cells: a high-nickel NMC chemistry in a much larger cylindrical format, roughly 123 kWh in the Cybertruck. It carries the same 8-year, 70% retention warranty with a 150,000-mile cap. Because 4680 packs have only shipped at volume since 2023, long-horizon fleet data doesn't exist yet; this calculator models them like other nickel packs but shows a wider uncertainty band.

In order of effort: (1) The Tesla app can run a remote battery check. Open Service and submit a range/battery concern; exact menus and availability vary by model, region, and software version, so check Tesla's official support pages for the current steps. (2) Third-party telemetry services such as Recurrent estimate capacity from charging data with zero risk to the car. (3) Tesla service can run an official capacity assessment, the measurement warranty claims are judged on. The in-car service-mode health test still exists on some vehicles, but it takes up to 24 hours, drains the pack to near empty, and Tesla has limited or removed it on recent software. Treat it as a last resort, not a first step. This calculator gives you the expected value to compare any of those against.

Partly. As of mid-2026, Tesla offers a Battery Extended Service Agreement for Model 3 and Model Y in the US and Canada: roughly $2,000 for 24 months or 30,000 miles of battery and drive-unit coverage after the factory warranty ends, with a $500 per-visit deductible. It must be purchased BEFORE the original 8-year battery warranty expires. Know what it covers: failures, not gradual capacity loss; the 70% retention guarantee ends with the factory warranty. Terms, pricing, and availability change, so verify the current details on Tesla's official Battery ESA page before deciding. If your pack is trending low, get Tesla's official test done while factory coverage is still active.