Used Tesla Battery Health
The battery is the most expensive part of a Tesla. Here's how to tell which battery a used car has, how much it has likely degraded, and how to check it before you buy.
A buyer's guide from Tesla Inventory Europe · Updated October 2026
A Tesla battery loses some capacity over time, like any lithium-ion battery. For most used cars this is a small effect: a few per cent of range, not a reason to avoid the car. What matters is knowing the battery type, checking the current health, and making sure there is enough warranty left.
LFP vs NMC: two kinds of Tesla battery
| LFP (lithium iron phosphate) | NMC / NCA (nickel-based) | |
|---|---|---|
| Typically found in | Standard-range Rear-Wheel Drive Model 3 and Model Y, including the former Standard versions | Long Range (including Long Range Rear-Wheel Drive) and Performance Model 3 and Model Y, and Model S and Model X |
| Daily charging | Charge to 100% — Tesla recommends it at least once a week | Around 80% for daily use; 100% only before long trips |
| Ageing | Tolerates frequent full charges and many charge cycles well | Ages faster if kept at high charge for long periods |
| Cold weather | Noticeably less range and slower charging in the cold until the battery warms up | Handles cold somewhat better |
| Energy density | Heavier for the same capacity, so usually less range | More range for the same weight |
General characteristics. The exact chemistry depends on the version, factory and production period — check the car itself.
To see which battery a car has, open Controls › Software › Additional Vehicle Information: the high-voltage battery type is listed there. Another clue is the charge-limit screen: on LFP cars Tesla recommends a 100% limit, on nickel-based cars it suggests a lower daily limit.
How much do Tesla batteries degrade?
Degradation is fastest in the first year or two and then flattens out. Tesla's own data showed an average capacity loss of about 12% after 200,000 miles (around 320,000 km) for Model S and Model X in its 2022 Impact Report, and about 15% after the same distance for Model 3 and Model Y in its 2023 report.
What speeds it up: very high mileage, frequent fast charging, keeping a nickel-based battery at a high charge for long periods, and hot climates. What it doesn't mean: a car that shows a bit less range than when new is usually perfectly healthy.
How to check the battery before you buy
- Tesla's Battery Health Test. Since software update 2025.8.3, Teslas have a built-in test under Controls › Service › Battery Health Test. The car must be below 20% charge, in Park and plugged into an AC charger of at least 5 kW (a wall charger, not a household socket); the test takes up to 24 hours. Afterwards it only becomes available again once the car detects a measurable change in the battery. Ask the seller for a recent result.
- Full-charge range. Ask for a photo of the estimated range at (or near) 100% and compare it with the original WLTP-based figure for that version and wheel size. A shortfall of a few per cent is normal for a used car.
- Warranty dates. Check the battery warranty end date and the distance limit. Tesla Inventory shows the battery warranty expiry on every vehicle page.
- Buying from Tesla. Used cars sold by Tesla have been inspected, and keep the remaining battery warranty. See is a CPO Tesla worth it?
The battery warranty
| Model | Battery and drive unit warranty | Minimum capacity |
|---|---|---|
| Model 3 / Model Y Rear-Wheel Drive (standard range) | 8 years or 160,000 km | 70% |
| Model 3 / Model Y Long Range (including Long Range RWD) and Performance | 8 years or 192,000 km | 70% |
| Model S / Model X | 8 years or 240,000 km (cars sold before early 2020: 8 years, no distance limit) | 70% |
The warranty runs from the car's first registration and transfers with it. A battery that falls below 70% within the term is covered; normal degradation above that is not. More details in our Tesla warranty guide.
Tips for a long battery life
- Follow the charge limit Tesla recommends for your battery type.
- Use fast charging when you need it, but charge at home or at work for everyday driving if you can.
- Avoid leaving the car for long periods at a very high or very low charge, especially in the heat.
- In winter, precondition the battery before Supercharging so it charges faster.
Frequently Asked Questions
How much do Tesla batteries degrade?
Most loss happens in the first years and then slows down. Tesla's Impact Reports put the average loss at about 12% after 200,000 miles (around 320,000 km) for Model S and Model X, and about 15% for Model 3 and Model Y. Individual cars vary with climate, charging habits and mileage.
How can I check the battery health of a used Tesla?
Recent Tesla software includes a Battery Health Test under Controls › Service. It needs the car below 20% charge and connected to an AC charger of at least 5 kW for up to 24 hours. Ask the seller for a recent result, or a photo of the full-charge range estimate.
Should I charge an LFP Tesla to 100%?
Yes. Tesla recommends charging LFP batteries to 100% regularly, at least once a week, so the car can estimate the charge level accurately. NMC and NCA batteries are best kept at around 80% for daily use and charged to 100% only before long trips.
Is a battery under 80% covered by the warranty?
No. Tesla's battery warranty covers loss of capacity below 70% within the warranty period (8 years, with a distance limit of 160,000 to 240,000 km depending on the model). Normal gradual degradation above that level is not a defect.
Guide by Tesla Inventory Europe (teslainventory.app), an independent site not affiliated with Tesla, Inc. Specifications, warranty terms and prices vary by market and change over time; always confirm current details with Tesla before buying.