Secrets to Checking a Used EV Battery Before You Buy

 

• 5 essential steps to verify the battery health of a used electric vehicle before making a purchase in 2026.

Buying a used electric vehicle is a great way to save money, but the most important component to inspect is the battery. Unlike a gas engine, an EV battery degrades over time. Here are 5 secrets to ensure you get a healthy battery in 2026:

​1. Check the State of Health (SoH):

Most modern EVs allow you to see the battery's "State of Health" directly in the dashboard settings. Look for a percentage—anything above 85% to 90% for a 3-4 year old car is excellent.

​2. Use an OBD-II Scanner:

For a deeper look, use a simple OBD-II Bluetooth scanner and an app like "LeafSpy" or "Recurrent." This will give you detailed cell-level data that the dashboard might hide.

​3. Verify the Warranty:

In the USA, federal law requires EV batteries to be warranted for at least 8 years or 100,000 miles. Always check if the remaining warranty is transferable to you as the new owner.

​4. Inspect the Charging History:

Ask the seller how they charged the car. Frequent use of "DC Fast Charging" can degrade a battery faster than slower "Level 2" home charging.

​5. Test Drive for Range Accuracy:

Take the car for a long test drive. Watch how the estimated range drops. If it drops significantly faster than the miles you are actually driving, the battery might have weak cells.

​Conclusion:

A used EV can be a fantastic deal, but don't skip the battery check. Following these steps will give you peace of mind and save you from expensive repairs down the road.