Few things are as frustrating as a car that will not start. Most battery failures are avoidable with a little routine care.
Corrosion on the terminals blocks current flow. Clean them with a baking-soda paste and a wire brush, then apply a little dielectric grease.
Vibration shortens battery life, so make sure the hold-down clamp is tight.
Short trips never fully recharge the battery. An occasional longer drive, or a smart trickle charger, keeps it topped up.
Lights and chargers left on overnight are the number one cause of a flat battery.
Cold weather cuts cranking power dramatically. Have the battery load-tested every autumn.
Slow cranking, dim lights and a swollen case all signal a tired battery.
Once a battery is past four years, keep a replacement budget ready. Steve AutoParts stocks batteries for every vehicle with free fitment advice.