The fear is a five-figure bill. The reality is more reassuring: EV batteries lose capacity slowly, and warranties are built around that. Tesla covers the Model 3 battery for 8 years, with 100,000 or 120,000 miles depending on variant, and a 70% minimum capacity (verify on tesla.com).
If it does fail
A new Model 3 pack installed out of warranty is roughly $10,500 to $19,000 in third-party US figures, but module repairs ($3,000 to $8,000) and refurbished packs (about $8,000 to $10,000) are often possible. Check your own situation with the EV calculator.
Falling pack prices
BloombergNEF reports average pack prices of $108 per kWh in 2025. That is a cost to carmakers, not the price you will pay for a replacement, but it explains why costs are falling over time.
The small battery
Do not forget the 12V battery. It is the one that most often fails, and it costs like any other: see the calculator.
Why EV batteries are built to last
Manufacturers design EV batteries to outlast the warranty because failures are expensive for them too. Packs have cooling or heating systems, battery management software that limits charging and discharging, and modules that can be repaired or replaced individually. That means a problem with a few cells does not necessarily mean a whole new pack.
What the warranty tells you
EV battery warranties normally state years, miles and a minimum capacity. For the Model 3, the figures we have are 8 years, 100,000 or 120,000 miles depending on variant, and 70% capacity. If the battery falls below the capacity threshold inside the window, it may be covered even if the car still runs. Toyota’s hybrid batteries have their own terms, which we cover on the Toyota page. Use the EV calculator to see where your car stands.
What drives replacement decisions
- Real failure: a fault that leaves the car unusable or unsafe.
- Heavy degradation: a big loss of range that affects daily use.
- Accident damage: a damaged pack may need to be replaced.
- Resale and cost: on older, lower-value cars, a pack cost can approach the car’s value, so some owners choose repair or sale instead.
Alternatives to a new pack
Independent EV specialists can often diagnose which modules are bad and replace them, and some offer refurbished packs. In the Tesla figures we have, module repair is quoted at about $3,000 to $8,000 and refurbished packs at about $8,000 to $10,000, compared with new at $10,500 to $19,000. These are third-party US ranges, so get a written quote.
The small battery
Even an EV with a healthy main pack can be stuck by a weak 12V battery. That one does need replacing in the ordinary way: see the 12V battery in hybrids and EVs and the cost calculator.
So, do they need replacing?
For most owners, within the warranty period, no. After that, it depends on how the battery has aged and how long you keep the car. The practical steps are to understand your warranty, check battery health yearly, ask about repair first and keep the budget in mind. Read EV battery health explained for how to check.