Repair vs replacement: when is which appropriate?
Most issues described as "battery faults" fall into one of three categories:
- Single module failure. One of the dozens of modules inside the pack has degraded. The faulty module is replaced; the rest of the pack is balanced. Cost: usually £400–£1,500.
- Cooling system fault. A leak, blocked passage or failed pump causes thermal warnings. Often £200–£600 to fix.
- Whole-pack degradation. The pack as a whole has lost significant capacity (typically below 70%) and a full replacement or major refurbishment is needed. Cost: £3,000–£20,000+ depending on the vehicle.
Always get a proper diagnostic before agreeing to any major work. A reputable specialist will share the battery management system's full health report.
How much does an EV battery repair cost?
Indicative UK prices (2026):
- Module-level rebalancing: £400–£900
- Single module replacement: £700–£1,800
- Cooling pump or coolant repair: £300–£700
- BMS (battery management system) replacement: £600–£1,400
- Full pack refurbishment / reconditioning: £3,000–£8,000 (depending on model)
- Full new battery (dealer): £10,000–£25,000 depending on the car
Signs your EV battery may need attention
- Sudden drop in range that doesn't recover after a full charge
- "Reduced power" or "service battery" warnings
- Slower DC fast-charging than usual
- Persistent yellow / orange battery icon
- One charge cycle showing very different range than the next
Any of these is worth booking a diagnostic. Most independent EV specialists will run a full battery health report for £80–£150 and credit it against repair work.
Is it covered by warranty?
Most UK EVs come with an 8-year / 100,000-mile battery warranty that guarantees no less than 70% of original capacity. If your pack drops below that within the warranty period, the manufacturer typically replaces or refurbishes free of charge. Outside warranty, an independent IMI Level 4 specialist is usually 30–60% cheaper than the main dealer.
EV Battery Repair near you
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