Will electric car batteries last?

THE biggest issue with electric cars, and particularly used EVs, is how well the batteries keep their charge. In the rare event you purchase a car that has trouble maintaining battery energy, then you’ll need to consider the cost of replacing the pack. This can be astronomical, although manufacturers now offer generous battery warranties, which should cover any issues.

This usually runs for longer than the car’s warranty. There was an industry-standard eight-year warranty on many models, although some earlier cars have a shorter five-year term. Either way, this should give you added peace of mind that the battery will keep its charge. Some brands even stipulate the acceptable capacity after eight years (often around 70 per cent), and will replace or refurbish the battery if it falls below this level.

The most common type of electric car battery is lithium-ion, which is the same as the packs in smartphones and computers. And, as with all batteries, these have a finite lifespan. Capacity is lost with every full charge and, in a car, this means the range decreases. However, you’ll have to do a lot of miles before you’ll see a significant drop in battery performance.

Batteries also suffer if they are exposed to very cold or very hot temperatures, or if the battery’s own temperature rises. Overcharging is stopped by software, but ‘deep discharge’ – using the battery’s maximum capacity repeatedly – is still a concern. That’s why charging to 80 per cent is recommended.

“Lithium-ion technology has improved a lot, but we’re now starting to see a variety of new chemistries entering the market, often through Chinese brands” CHRIS ROSAMOND

Current affairs editor