16/10/2026
What's Wrong With My Battery? 🔋 The battery overheats while driving.
Some warmth during charging is normal. Excessive heat signals a potential fault that could damage the battery or create a safety risk.
What causes it?
• Overcharging A faulty voltage regulator may allow excessive charging voltage, generating heat and gas inside the battery. Continued overcharging damages internal components and shortens battery life.
• Loose or corroded connections Poor connections create electrical resistance, generating heat at terminals and cables. Left unchecked, this may damage wiring and disrupt charging.
• Internal battery faults An internal short circuit or damaged cell generates heat inside the battery. This may lead to swelling, leakage and permanent damage.
• Excessive engine heat High temperatures under the bonnet accelerate battery deterioration. Combined with charging faults, this can push battery temperatures dangerously high.
When should you act? Slight warmth is not necessarily a problem. A battery that becomes very hot, swells, leaks, hisses or smells of rotten eggs needs urgent attention. Stop when safe, switch off the engine and keep away. Do not touch or disconnect the battery. Arrange a professional inspection.
Replacing the battery without identifying the cause risks damaging its replacement.
Battery Corp branches are run by veterans of the battery industry, with many years of experience behind them. Visit your nearest Battery Corp branch for expert advice and complimentary battery testing.