{"id":10599,"date":"2025-03-21T23:56:01","date_gmt":"2025-03-21T23:56:01","guid":{"rendered":"https:\/\/carexamer.com\/blog\/?p=10599"},"modified":"2025-03-26T14:09:10","modified_gmt":"2025-03-26T14:09:10","slug":"used-electric-car-how-to-check-battery-health-and-warranty","status":"publish","type":"post","link":"https:\/\/carexamer.com\/blog\/used-electric-car-how-to-check-battery-health-and-warranty\/","title":{"rendered":"Used Electric Car How to Check Battery Health and Warranty"},"content":{"rendered":"\n

Ensure your used electric vehicle is a smart buy. Learn how to How to Check Battery Health and Warranty and avoid common pitfalls when buying. Used electric cars have become popular in the UK, but buyers should pay special attention to battery health and remaining warranty. This guide walks you through evaluating a used EV before you plug and drive.<\/p>\n\n\n\n

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Book inspection<\/a><\/div>\n<\/div>\n\n\n\n

Why Battery Health Matters<\/h2>\n\n\n\n

The battery pack is the heart of an electric car \u2013 and the most expensive component. Most EV batteries are designed to last the car\u2019s life, often retaining 70-90% of capacity after 8-10 years. However, poor charging habits or high mileage can cause faster degradation. A healthy battery means dependable range and fewer future costs.<\/p>\n\n\n\n

How to Check Battery State-of-Health (SoH)<\/h2>\n\n\n\n

1. Dashboard Readout:<\/strong> Many EVs display battery health or \u201cState of Health\u201d in a service menu. For example, Nissan Leafs show the health via 12 bars on the dash \u2013 fewer bars mean reduced capacity. A 10\/12 bar Leaf battery might have ~83% of its original capacity.
2. Use an OBD-II Scanner:<\/strong> With a Bluetooth OBD-II dongle and an app (Tesla diagnostic software is very limited or mostly not existing yet in aftermarket, they do have self-diagnoses capability), you can get detailed battery stats. You\u2019ll see metrics like SOH%, total kWh remaining, and even weak cell flags in some cases. If SOH is, say, 92%, that\u2019s excellent for a 5-year-old EV. If it\u2019s 70% or lower, expect much less range than a new model advertised.
3. Driving Range Test:<\/strong> Take the car on a longer test drive (with seller\u2019s permission). Note the displayed range at the start and the energy percentage. Drive a set route (~10 miles) and see how many miles of range you actually use. If the car started at 80% (say 160 miles range) and after 10 miles it\u2019s at 74% (expected ~144 miles range remaining but shows, for example, only 130), the discrepancy could indicate battery wear or an out-of-calibration range estimator.<\/p>\n\n\n\n

Examine the EV\u2019s Charging History<\/h2>\n\n\n\n

Ask the seller about charging habits \u2013 it\u2019s a fair question that can reveal battery stress:<\/p>\n\n\n\n