What happens if an electric car runs out of charge?

Running out of charge is less common than the anxiety around it suggests, and it is far less abrupt than running out of petrol. The car has been telling you for a long time by then. What makes it worse than a fuel breakdown is the recovery, not the stopping: you cannot walk to a garage with a can, and the car cannot simply be dragged to the nearest charger because most electric drivetrains are permanently connected to the wheels, so turning the wheels turns the motor. That is why a flatbed or a set of dollies is usually necessary, and why an EV recovery takes longer to arrange.

Safety

Step by step

1. Take the early warnings seriously.EVs warn well in advance — a low charge message, then a stronger one, then rerouting to the nearest charger, then a message that climate control is being reduced. Each of those is a decision point. The car is trying hard to prevent this.
2. Reduce consumption immediately if you are short.Slow down, which is by far the biggest lever at speed. Turn the cabin heating down and use heated seats instead. Turn off anything unnecessary. Slowing from 70 to 55 makes a substantial difference to how far the remaining charge goes.
3. Reroute to the nearest working charger, not the best one.Use the car's own planner if you can, because it knows the state of charge. A slow charger you can reach is worth more than a rapid one you cannot. A domestic three-pin socket at a friend's house will do at this point.
4. Understand turtle or reduced power mode.Below a threshold the car limits power severely to eke out what is left. Acceleration becomes very slow and top speed drops. Get off fast roads immediately when this happens — a car that cannot accelerate is a hazard on a dual carriageway.
5. Know that there is a reserve, and that it is small.Manufacturers hold back a buffer below zero to protect the cells from deep discharge, and the car uses part of it during the warnings. Do not plan around it: by the time you see zero, most of what was there is gone.
6. Get off the carriageway and call for assistance.Exactly as with any breakdown. The catalogue's breakdown guide covers the safety sequence, and on a motorway it applies in full — out on the left, behind the barrier, and call from there.
7. Tell the recovery operator it is electric.This matters. Most EVs must be transported on a flatbed, or with the driven wheels lifted on dollies, because the motor is permanently geared to the wheels and towing spins it — which can damage the drivetrain and, on some cars, generate current with nowhere to go. Say so when you call so the right vehicle is dispatched.
8. Ask whether your provider carries a mobile charger.The major UK providers have deployed mobile rapid charging units on some patrol vehicles, which can put in enough charge to reach a proper charge point. Coverage is patchy and it is not guaranteed, but it is worth asking when you take out cover as well as when you break down.
9. Change the planning habit afterwards.Plan to arrive at chargers with fifteen to twenty per cent rather than five, and always identify a backup charger on the route. Charge point reliability is the real variable, not the car — a planned charger that is broken or occupied is how most people get into trouble.

Common mistakes

• Planning to arrive at a charger with five per cent — It leaves no margin for a broken charger, a queue, a headwind or a diversion. Fifteen to twenty per cent removes almost all of the risk and costs a few minutes.
• Letting a recovery operator tow it on its driven wheels — Most electric drivetrains have no neutral that disconnects the motor. Towing spins the motor and can cause expensive drivetrain damage. Flatbed or dollies, always, unless the handbook explicitly permits otherwise.

If it doesn't work

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