Buying a Used EV in 2026: 5 Secrets to Checking Battery Health

 

person checking used EV battery health diagnostic monitor in USA

  • A visual guide to how to properly check a used electric vehicle's battery health before you buy.



Buying a used electric vehicle (EV) is a great way to save money, but the most critical part is the battery. Unlike a gas car's engine, an EV battery degrades over time. Here are 5 things you must check before buying:

​1. State of Health (SOH):

Always ask the seller for a "Battery Health Report." Most modern EVs in 2026 allow you to see the SOH percentage directly in the car's settings. Aim for anything above 85%.

​2. DC Fast Charging History:

If a car was charged exclusively using fast chargers, the battery might have more wear. A mix of home charging and occasional fast charging is the ideal history.

​3. Realistic Range vs. Factory Range:

Charge the car to 100% and see what the "GOM" (Guess-O-Meter) says. If the original range was 300 miles but it now shows 240 miles, that’s a 20% drop.

​4. Software Updates:

Ensure the vehicle has the latest Thermal Management software updates. This keeps the battery cool and extends its life.

​5. Transferable Warranty:

Most manufacturers offer an 8-year or 100,000-mile battery warranty. Verify if this warranty transfers to you as the second owner.


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