Ask someone what worries them about owning an electric car and almost everyone says the same thing: the battery. Ask a garage what actually comes through the door and you get a completely different list — and most of it is a lot cheaper than the thing everybody is afraid of.
The battery is the headline, not the common fault
Traction battery failure is the story that gets written because the number is frightening. A full pack replacement runs from roughly £5,100 to £14,200 fitted, depending on the car. Nobody wants that letter.
But it is not what most electric cars go wrong with. Battery packs are built to outlive the finance agreement, and manufacturers back them accordingly: eight years or 100,000 miles is the standard, with a state-of-health floor of around 70% written into the terms. Kia, for example, covers repair or replacement if the pack drops below 70% capacity inside eight years, and that cover transfers to the next owner.
Two things follow from that. First, on most used EVs the pack is still under factory cover, so it is not the thing you need to insure against. Second, when a pack does play up it is very often one module out of dozens, not the whole thing — and a module repair is a fraction of the price. Always ask whether a module repair is possible before anyone quotes you for a full pack.
So if the battery is not the everyday problem, what is?
The 12-volt battery: small, cheap, and the usual culprit
This surprises people every time. Electric cars still have an ordinary 12-volt battery under the bonnet or in the boot, the same as a petrol car, and it is the single most common reason an EV refuses to wake up.
It runs the locks, the lights, the computers and the contactors that connect the big battery in the first place. If it is flat, the car is dead — even with 80% showing on the traction pack. It is also worked harder than people assume, because there is no alternator constantly topping it up; it is charged in bursts by a DC-DC converter.
The good news is that it is a normal battery at a normal price, usually well under £200 fitted. The bad news is that it is a consumable, which means no warranty on earth covers it — the same way no warranty covers tyres or wiper blades. Replace it on age, around the four-year mark, and you will avoid most of the "my EV won't start" panic.
The on-board charger and the charge port
The on-board charger is the unit that turns AC from your home wallbox into DC the battery can take. When it fails, the car usually still rapid-charges on a public DC charger but refuses to charge at home — which is a very particular kind of annoying.
It is a genuine repair bill: roughly £1,000 to £2,400 with labour, because it is usually buried and needs the high-voltage system isolating before anyone can touch it. That isolation work is also why EV jobs carry more labour hours than the equivalent-sounding petrol job.
Charge ports themselves are simpler and cheaper, but they take a beating — flaps that get forced in winter, locking pins that stick, pins that corrode on cars parked outside. Worth checking on any used EV you are looking at. Plug it in before you buy it.
The drive unit: the one nobody talks about
The drive unit is the motor, the reduction gear and the inverter, usually as one sealed assembly. It is a beautifully simple thing compared with an engine and gearbox — far fewer moving parts, no clutch, no timing chain, no exhaust.
The catch is that when something inside it does fail, it is almost never opened up. It is replaced as a unit, and that runs to about £3,600 to £7,200 fitted. Bearing wear is the usual cause, and the first sign is normally a whine that rises and falls with road speed rather than with the accelerator.
This, rather than the battery, is the bill we would want covered on an out-of-warranty EV. It is uncommon — but it is not rare enough to ignore, and unlike the pack it very often sits outside the eight-year battery cover.
Heat pumps, coolant pumps and the thermal system
Electric cars care enormously about temperature. The pack has to be kept in a fairly narrow window to charge quickly and last well, and the cabin has to be heated without an engine making free waste heat. That is a whole cooling and heating system of its own.
A heat pump or thermal unit is typically £900 to £2,200. A battery cooling pump or fan is much less, around £350 to £900 — but it is the one worth catching early, because a pack that is not being cooled properly is a pack that ages faster. If the cooling fans are running hard when the car is just sat charging, or range has dropped off noticeably in warm weather, get it looked at.
Hybrids have their own version of this problem. A hybrid inverter or converter sits at roughly £1,200 to £2,800, and it is one of the more common expensive failures on older hybrids.
You can see all of these side by side, with the parts and labour split out, in our Repair Costs Hub.
The ordinary things that still wear out
It is easy to forget that an EV is still a car. Suspension, steering, air conditioning, wheel bearings, window regulators, infotainment — all of it goes wrong at roughly the rate it does on anything else.
Two things are worse on an electric car, and both come down to weight. Tyres wear faster, because the car is heavier and the torque arrives instantly. Budget for that; it is a real running cost and no warranty covers it. And suspension components work harder, so bushes, springs and top mounts tend to come up a little sooner than you would expect for the mileage.
One thing is genuinely better, and one is genuinely odd. Brake pads and discs last far longer, because regenerative braking does most of the slowing down. The odd part is that this is exactly why EV brakes seize — calipers that are barely used corrode, especially through a salty winter. It is the one job an EV needs that a petrol car mostly does not.
What this means for cover
Put that list next to a warranty and a pattern appears.
- The traction battery is usually still under factory cover, and independent policies commonly exclude it — so check, and do not assume.
- The 12-volt battery, tyres, brake pads and wiper blades are wear items. Nothing covers them. That is not small print being unfair; it is what a warranty is.
- The drive unit, on-board charger, heat pump, cooling pump and inverter are the ones that matter. They are proper failures, they cost four figures, and they are exactly what a mechanical and electrical breakdown policy exists for.
When you are comparing cover on an EV, that middle group is where the question should be pointed. Not "do you cover electric cars" — almost everyone says yes to that — but "is the drive unit listed, and is the on-board charger listed, and what is the claim limit". A policy with a £1,000 claim limit does not meaningfully cover a £4,000 drive unit.
ClearPath takeaway
The fear is the battery. The bills are everything around it.
If you are running an electric car past its factory warranty, the sensible position is to assume the pack will probably be fine and the supporting cast might not be. Check the remaining manufacturer battery cover first — you may have years of it left, and it may transfer with the car. Then look at what a policy actually names for the drive unit, charger and thermal system, and at the claim limit next to those numbers.
ClearPath pays up to £3,000 a claim with a £100 excess, at an independent garage labour rate of £100 an hour. On the figures above that covers most of this list outright and takes a serious bite out of the rest.
