Why battery damage triggers a write-off so readily
Electric cars can be written off after damage that would leave an equivalent petrol or diesel car repairable. The battery pack is often 30-50% of the car's total value, and relatively few insurers or bodyshops currently have the specialist capacity to safely assess or repair a damaged one cheaply — so the maths tips toward "write it off" much sooner than it would on a conventional car. This matters directly if you're checking a used EV's history before buying: this guide covers why that happens, whether used EVs are actually written off more often overall (the honest answer is more complicated than it sounds), and what a history check can and can't tell you about it.
Why EV batteries get written off so easily
Where the battery sits, and why that makes it vulnerable
Most EVs use a "skateboard" layout — a large, flat battery pack mounted low across the underside of the car. That placement is good for handling and interior space, but it puts the battery directly in the path of kerb strikes, deep potholes and flood water, in a way a conventional car's mechanical components underneath generally aren't.
Why insurers total the car rather than repair it
A few things push the decision toward write-off rather than repair: the repair cost relative to the car's value tips over the write-off threshold faster once a battery's involved; there's a genuine shortage of high-voltage-qualified technicians able to safely assess or repair a damaged pack; and even inspecting a battery that might be compromised carries its own safety-quarantine costs, since a damaged high-voltage battery can pose a fire risk that has to be managed carefully.
Are used EVs actually more likely to be a write-off?
This is genuinely more nuanced than it sounds, and it's worth being honest about rather than picking whichever figure sounds more dramatic.
On one hand, research from FWD Consulting found that roughly one in five EVs involved in a collision are written off, often after relatively minor impacts — reported to cost UK businesses over £461 million a year in EV write-offs. On the other, analysis by Cap HPI of write-offs from 2015 to August 2024 found EVs under five years old were written off at less than half the rate of petrol and diesel cars overall (0.9% vs 1.89%; a similar gap at one year old, 0.2% vs 0.4%).
These aren't actually contradictory — they measure different things. The FWD Consulting figure is conditional on already being in a collision: if an EV crashes, it's disproportionately likely to be written off rather than repaired. The Cap HPI figure is a whole-fleet rate: across every EV on the road, including the large majority that are never in a collision at all, the overall share ending up written off is lower than for petrol and diesel cars. Both can be true at once. The honest summary: an EV that's actually crashed faces a real chance of being written off for damage a petrol or diesel car would survive as a repair — but that doesn't mean EVs as a whole are more likely to end up written off, since fewer EVs get into collisions serious enough to trigger the question in the first place.
What write-off category means for a battery-damaged EV
The Cat A/B/S/N categories work the same way for an EV as any other car — see our full guide to insurance write-off categories for the general mechanics, and our deep dives on Cat S and Cat N cars specifically.
What's genuinely EV-specific: the ABI's own salvage code was updated in May 2025 to add high-voltage-battery-specific handling rules. Some manufacturers class their batteries as non-repairable outright, meaning a damaged pack has to be recycled rather than fixed. Where a battery is repairable, that work needs a qualified high-voltage technician, given the safety-critical nature of the system — not a general-purpose bodyshop.
How much does EV battery damage actually cost to fix?
Figures vary widely depending on the model and the damage, so treat any single number as a rough guide rather than a quote. Thatcham Research's own analysis puts BEV insurance claims at roughly 25% more expensive than an equivalent petrol or diesel claim, taking around 14% longer to repair. Replacement high-voltage battery costs range from roughly £14,200 at the lower end to £29,500 at the higher end depending on the vehicle — on a car that's a few years old, a replacement battery can realistically cost more than the car itself is now worth, which is a large part of why the write-off maths tips the way it does.
You may also see a figure claiming "22% of EVs in accidents sustain battery damage," attributed to ABI/Thatcham research. We couldn't trace that figure to either source — it appears to conflate a different, unrelated statistic: the Institute of the Motor Industry's estimate that around 22% of UK technicians were fully EV-qualified, which was roughly accurate in early 2024 but has since moved well past that (over a third, per IMI's own more recent data) — not a live figure to quote either way. We're flagging it here rather than repeating it, since it circulates on several other sites covering this topic.
Buying a used EV — checking for hidden battery or collision damage
A practical checklist for a used EV you're considering:
- Underbody scrapes, dents or repainted patches on or near the battery casing.
- Inconsistent panel gaps or paint that doesn't quite match between adjacent panels — signs of repair work.
- A battery State of Health (SoH) reading that doesn't match the car's age and mileage — unusually poor health on a relatively young, low-mileage car is worth questioning.
- Gaps in the service or repair history around a period that doesn't add up.
- A price that undercuts similar listings without an obvious explanation — worth asking directly why.
What a history check does and doesn't tell you
Our Comprehensive check confirms a car's write-off category, recorded mileage, outstanding finance and stolen status — the same as it would for any car, electric or otherwise. You can see exactly what one covers in this sample report.
Worth being direct about: it doesn't test the battery's health directly. If you want to actually assess a specific EV's battery condition — a State of Health reading and the other EV-specific checks — that's a separate step at the viewing, not something any history check covers. See our guide to buying a used electric car for the full battery and SoH-testing checklist.
Buying a Cat S or Cat N EV specifically — extra questions to ask
If a used EV you're looking at carries a Cat S or Cat N marker, a few extra questions are worth asking beyond what you'd ask on a petrol or diesel car in the same category: ask for the repairer's post-repair battery State of Health report specifically, ask what high-voltage safety sign-off the repair carried, and consider an independent EV specialist inspection before committing — not every general mechanic is equipped to properly assess a repaired high-voltage system.
FAQs
Are electric cars more likely to be written off than petrol or diesel cars?
It depends what you mean. An EV that's actually been in a collision faces a real chance of being written off for damage a petrol or diesel car would survive as a repair (roughly one in five, per FWD Consulting research). But across the whole EV fleet, including cars that never crash at all, the overall write-off rate is actually lower than for petrol and diesel cars, per Cap HPI's analysis — these are different measurements, not contradictory ones.
Why does battery damage make an EV a write-off when the rest of the car is fine?
The battery pack is often 30-50% of the car's value, sits low across the underside where it's exposed to kerb strikes and flooding, and needs a qualified high-voltage technician to safely assess — all of which push the repair-vs-write-off maths toward write-off faster than on a conventional car.
What does Cat S or Cat N mean for an electric car specifically?
The same general mechanics as any car, but the ABI's salvage code has specific rules for high-voltage batteries — some manufacturers class batteries as non-repairable, meaning they must be recycled rather than fixed, and any repairable battery work needs a qualified HV technician.
How much does it cost to replace or repair a damaged EV battery?
Figures vary a lot by model, but replacement high-voltage batteries commonly run from roughly £14,200 to £29,500 — on an older car, that can exceed the car's own current value.
Can a history check tell me if a used EV's battery has been damaged?
Not directly. A Comprehensive check confirms write-off category, mileage, finance and stolen status for an EV the same as any car, but it doesn't test battery health — that needs a separate check at the viewing.
What should I check before buying a used EV that might have been repaired after an accident?
Look for underbody scrapes or repainted patches near the battery, inconsistent panel gaps, a battery health reading that doesn't match the car's age, and gaps in the service history. For a Cat S or Cat N car specifically, ask for the repairer's post-repair battery health report and consider an independent EV specialist inspection.