The UK is bracing for a heatwave with temperatures expected to reach 38°C, and motorists are being warned that their car batteries could be at risk of damage. While batteries are typically associated with winter breakdowns, hot weather can be equally detrimental, leading to costly repairs.
Heatwave Threat to Car Batteries
According to motoring specialists at DCM Autocentres, high temperatures can shorten battery life. "Heat speeds up chemical reactions inside the battery, which can increase wear over time," they said. "Older batteries may struggle after prolonged hot weather, particularly if they're already weakened. Short journeys, stop-start driving and heavy use of air conditioning all add additional strain." A standard car battery costs between £70 and £120, averaging around £100.
How Heat Damages Batteries
Experts at Halfords explained that heat causes long-term damage. "Hot weather can cause the fluid inside your battery to evaporate, leaving internal parts exposed and vulnerable to damage. It also speeds up corrosion around the terminals and can lead to overcharging, which shortens the battery's lifespan. On top of that, heat encourages sulphate build-up inside the battery, making it harder to hold a charge."
Signs of Battery Trouble
Halfords urges drivers to watch for warning signs. A battery warning light on the dashboard is a key indicator. Other symptoms include the car taking longer to start, flickering lights, or electrical glitches. During the heatwave, drivers should check their battery condition to avoid being stranded.
