Car Battery: How Long It Lasts and Signs It Is Failing

A car battery typically lasts several years, but heat, short journeys, and long periods of inactivity can shorten its life.

Testing the battery as part of routine servicing is the easiest way to avoid surprises.

Warning signs

▸Slow cranking when starting
▸Dim headlights at idle
▸Battery warning light
▸Electrical glitches
▸Corrosion on terminals
▸A swollen battery case

What shortens battery life

▸Frequent short trips that do not recharge the battery fully
▸Extreme heat
▸Leaving the car unused for weeks
▸Faulty charging systems

Testing

Many garages and parts shops can test a battery and charging system. A multimeter reading gives a rough indication of charge but does not show capacity under load.

Replacement

Use the battery type specified for your car, particularly for vehicles with start-stop systems, which often require AGM or EFB batteries.

If you store your car

Use a battery maintainer or disconnect the battery if the car will be unused for long periods, following the manufacturer's advice.

CAUTION: This is general automotive information, not professional mechanical advice. Always follow your vehicle manufacturer’s specifications and service schedule, and have brakes, steering, tyres, and other safety-critical systems inspected by a qualified mechanic.

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