Battery Technology · 5 min read
Will My EV Battery Need Replacing After 5 Years?
One of the most common questions from new EV buyers is whether they'll be facing a huge battery bill in a few years. For most modern EVs, the answer is reassuring.
An EV battery is more like a slow-fading torch than a light bulb that suddenly blows.
Battery degradation
All rechargeable batteries lose a small amount of capacity over time. In EVs this is typically 1–2% per year in the first few years, tapering off after that. It rarely stops the car working — you just get slightly less range.
Battery management systems
Modern EVs actively protect the battery: limiting extreme charge levels, managing temperature, and adjusting how power flows in and out. This is a huge reason batteries last far longer than early EV critics predicted.
Expected lifespan
Real-world data from high-mileage EVs — including taxis and fleet vehicles — shows most batteries comfortably last well beyond 100,000 miles with meaningful capacity remaining. Full replacements early in life are rare and usually a warranty issue.
What warranties typically cover
- ✓Duration of eight years or 100,000 miles is common
- ✓A minimum capacity threshold (often 70%) below which the battery is repaired or replaced
- ✓Manufacturing defects and unusually fast degradation
Most UK EV manufacturers offer battery warranties of eight years or 100,000 miles — often guaranteeing at least 70% capacity retention.
Focus on percentage-capacity retained after 100,000 miles, not "will it die" — batteries fade gradually, they don't fall off a cliff.