Car Batteries
How long a car battery lasts, the signs it is failing, what shortens its life and what to know about hybrid and electric batteries.
A conventional 12-volt car battery is a wear item with a limited life, and it tends to fail without much warning, often on a cold morning or after the car has stood for a while. Modern cars place heavier demands on the battery than older ones did because of stop-start systems, always-on electronics and the number of modules that draw a small current even when the car is locked. Short trips that never fully recharge the battery, extreme heat and long periods parked all shorten its life.
Hybrid and electric vehicles add a second, high-voltage battery pack that is engineered and warranted very differently from the 12-volt unit, and it is covered by a separate, longer warranty from the manufacturer. Most new cars in the Car4Less showroom, whether petrol, hybrid or electric, carry both, so it helps to understand which battery does what, what the warranty covers and which habits keep both healthy.
Car Batteries — questions
The questions people ask about car batteries, answered plainly.
How long does a car battery last?
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A conventional 12-volt battery in a modern car typically lasts a few years, with the exact life depending on climate, driving pattern and the electrical load on the car. Frequent short trips, extreme heat and long periods of standing shorten it. Many manufacturers cover the battery under the new-car warranty for a set period, after which replacement is the owner's cost unless a maintenance plan includes it.
What are the signs that a car battery is failing?
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Slow or laboured cranking when you start the car, dimming headlights at idle, a battery warning light, electrical gremlins such as a resetting clock, and a stop-start system that stops working are the usual signs. Dealers can load-test a battery in minutes at a service, so ask for a check if you notice any of these, especially before a long trip.
Does a hybrid or electric car battery need replacing like a normal battery?
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The high-voltage battery in a hybrid or electric car is designed to last the practical life of the vehicle and is covered by a separate manufacturer warranty that is usually much longer than the standard vehicle warranty. Capacity declines gradually over many years rather than failing suddenly. These vehicles still have a small 12-volt battery for the electronics, which ages like any other.
Can I jump-start a modern car safely?
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Yes, but follow the procedure in the owner's manual, because many modern cars have specific jump-start terminals and sensitive electronics that can be damaged by a wrong connection. Hybrids and electric cars have their own instructions and must never be used to jump-start another vehicle. If you are unsure, roadside assistance from the manufacturer is usually included with a new car.
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