Check your car battery in 2 minutes before winter

The first frost of the year is the day with the most cars that won't start: cold cuts the cranking power of an ageing battery by up to 35%.

This 2-minute check tells you whether your battery will make it to spring or whether it's smarter to replace it now, calmly and at the best price, instead of on a freezing Monday with a tow truck.

Already been left stranded one morning? Here we explain why your car won't start in winter and how to avoid it.

The 5 signs it won't survive winter

1. It's more than 4–5 years old. That's the average lifespan; beyond it, every frost is a lottery.
2. Sluggish starts. The engine turns over more slowly than usual, especially in the morning.
3. Lights dim at idle or when starting.
4. Below 12.4V at rest. With a multimeter, measure after the car has sat for hours: 12.6V is good, 12.4V is marginal; below that, recharge it and, if it drops again, replace it.
5. You only do short trips. The battery never fully recharges and the cold finishes the job.

Showing signs? These are the most common replacements

If your battery ticks two or more boxes, replace it before the first frost. These are our best sellers, with express 24h delivery:

Frequently asked questions

Can I wait until it dies completely?

Better not: a dying battery punishes the alternator and starter motor, and tends to strand you on the coldest day. Replacing it in time is cheaper than a tow.

How long does a car battery last?

Between 4 and 6 years depending on use and climate. Short trips and the previous summer's heat shorten its life.

How do I find my car's exact battery?

With your number plate: our finder identifies your vehicle and shows only compatible batteries.