How to Maintain Your Car Battery in Australian Heat

Australians replace over two million car batteries every year, and a staggering percentage of those failures are entirely preventable. Extreme heat accelerates the chemical reaction inside a lead-acid battery, causing fluid to evaporate and internal plates to degrade far faster than in cooler climates.

The single most important habit is keeping the battery terminals clean. Corrosion — that white, crusty buildup around the terminals — creates electrical resistance that forces the battery to work harder. A simple mixture of baking soda and water, applied with an old toothbrush, will neutralise the acid and restore a clean connection. Do this every six months.

Check the electrolyte level if you have a serviceable battery. Most modern batteries are sealed, but if yours has removable caps, ensure the fluid covers the internal plates. Top up only with distilled water — never tap water, which contains minerals that accelerate corrosion.

Minimise short trips. A battery needs sustained driving time to fully recharge after starting the engine. If your daily commute is under fifteen minutes, your battery is likely running at a permanent partial charge, which shortens its life dramatically. Consider a trickle charger for vehicles that sit unused for days at a time.

Finally, have your battery tested annually once it passes the three-year mark. Most automotive electricians will test it for free, and catching a weak battery before it fails saves you from the far greater inconvenience of a roadside breakdown. CGS Online Car Yard customers receive complimentary battery testing with every scheduled service visit.