Batteries hate cold weather. Inside that little box under your bonnet, chemical reactions are taking place to store and release electricity. As you may remember from science class, chemical reactions happen faster with heat. In cold weather, the battery becomes weaker.
This slowdown coincides with increased demand for power as temperatures drop. Starting the engine is more difficult because the oil thickens and becomes harder to churn. At the same time, you’ll be using the fans and heating elements to keep the windows clear and warm your seat. The wipers will also be in frequent use, and with fewer daylight hours, you’re more likely to need the lights too.
As a result, a battery that seemed fine in summer may suddenly fail in winter. To avoid getting stranded, it’s a good idea to watch for warning signs and ensure your battery is ready. Here are our experts’ top tips for preparing your car battery for cold weather.
If you notice your car is slower to start as the weather gets colder, it may be time to have your battery tested. However, it could simply need a charge, especially if you’ve been making a lot of short journeys. If the battery remains weak after driving for 20 minutes or more, it is likely faulty. Our experts at Eden can test it for you and confirm whether it is still performing as intended.
There are also some checks you can do yourself. Older batteries may have transparent cases or a small window allowing you to check the fluid level. The water should cover the lead plates, or there may be a marked minimum level. If the water needs topping up and the battery isn’t sealed, it is important to use distilled water, which is available from any hardware shop.
More modern batteries may have a small window with an indicator inside. If it shows green, the battery is healthy. If it appears red, the battery needs charging or may be faulty and require replacement.
Additionally, check that the terminals and leads aren’t excessively corroded or loose. As part of a service, these will be inspected and coated with grease or another protective material to keep them in good condition.
Contact the Eden Aftersales Team With A Battery-Related Enquiry
The aftersales team at Eden can advise you on the correct battery for your car, based on the size and power originally specified by the manufacturer. While it may be tempting to opt for a cheaper battery with less capacity, it might seem sufficient in summer but will struggle once the weather turns colder.
Some cars come with a battery cover as standard, helping to protect it from extreme temperatures. Not only does it shield the battery from the cold, but it also prevents it from overheating—especially important if the engine bay is cramped or the battery is positioned near a heat-producing component, such as a turbocharger exhaust.
Unless you’ve made modifications to your car or regularly drive in very hot or cold conditions, an additional cover shouldn’t be necessary.