The battery is the most expensive component in any Tesla, so checking its health before buying used is essential. A bad battery can cost thousands to address, while a healthy one means years of worry-free driving. Here's exactly what to check and how.
Before the Test Drive: Know What's Normal
Before you see the car, know what to expect. Battery degradation varies by model, year, mileage, and chemistry.
| Age / Mileage | Expected Battery Health |
|---|---|
| 1–2 years, under 30,000 miles | 95%–98% |
| 3–4 years, 40,000–80,000 miles | 90%–95% |
| 5–6 years, 80,000–120,000 miles | 87%–93% |
| 7+ years, 120,000+ miles | 83%–90% |
If a car falls significantly below these ranges, proceed with caution.
The 6-Step Buyer's Checklist
Step 1: Check Displayed Range at 100%
Ask the seller to charge to 100% before you visit. Compare the displayed range to the EPA rating for that model year and variant. Within 10%–15% of original is generally normal for a car with moderate mileage.
Step 2: Use the Energy Screen
A more accurate quick check. Note the average energy consumption, projected range, and state of charge percentage. Our battery health calculator does the maths automatically if you have these three numbers.
Step 3: Ask About the Battery Health Test
If the seller has run Tesla's built-in test (Controls > Service > Battery Health), ask to see the result. This is the most reliable owner-accessible data point.
Step 4: Check the Service History
Look for battery replacements, module swaps, repeated charging complaints, and major software updates. Tesla service records are accessible through the app.
Step 5: Ask About Charging Habits
A car that was primarily home-charged will generally have a healthier battery than one Supercharged daily. Climate matters too — cars in hot regions may show more degradation.
Step 6: The Test Drive
During your drive, pay attention to acceleration — does it feel strong and consistent? Regenerative braking — does regen feel normal when the battery isn't full? Charging behaviour — if you can Supercharge, note the peak charge rate. Energy consumption — watch the energy graph for unusual readings.
Red Flags
"Watch out for: more than 20% degradation within the warranty period, sudden range drops rather than gradual decline, inconsistent displayed range that jumps around between charges, active error messages related to battery or charging, and a seller who won't let you check battery health data."
Should Battery Health Be a Dealbreaker?
Not usually. Most used Teslas have perfectly healthy batteries, and the warranty transfers with the car. A car showing 88% health at 80,000 miles is in great shape — that's still 250+ miles of range on a Long Range model. The battery should only be a dealbreaker if degradation is abnormal for the car's age and mileage, if there are red flags in the service history, or if the warranty has expired and health is below a level you're comfortable with.
Evaluating a used Tesla? Use our free Tesla Battery Health Calculator to estimate the battery's health before you commit.
Check Battery Health