How long can a car battery sit unused?
How long can a car sit idle before the battery goes flat?
If your car sits unused for an extended period, the battery will eventually go flat. There are many reasons a vehicle may remain idle - from lifestyle changes to waiting to pass your driving test. In situations like this, you may also want to consider applying for a SORN declaration if the car will not be driven for a while.
Car maintenance becomes even more important when a vehicle is left unused. Many drivers return to their car after weeks or months only to find that it won’t start, usually because of a flat battery. If this happens, you may need to jump start your car.
This guide explains how long a car can sit without being driven, and how to maintain an idle vehicle properly.
How to take care of an idle car
If you know your car will be unused for a long period, there are several steps you can take to store it safely and prevent damage.
1. Use wheel chocks
Avoid leaving the handbrake engaged for long periods. The brake pads can stick to the discs, causing issues when you next drive. Instead, place wheel chocks or a block of wood behind the wheels to keep the car secure.
2. Invest in a car cover
If you don’t have access to a garage, a fitted car cover protects your vehicle from weather, debris, and UV damage while it sits outside. You can easily buy the right car cover for your size and model of vehicle.
3. Fill up the fuel tank
The benefits of a full tank go beyond the convenience of driving straight away when you come to need your vehicle! A full tank helps prevent rust forming inside the fuel tank - a common issue for cars left unused. After filling up, ensure the cap is sealed tightly to keep moisture out.
4. Change the engine oil
Before leaving your car unused it is recommended that you replace the old engine oil in your car. Old oil contains contaminants that can harm your engine if left sitting. Replace the oil before storing the car, then drive a few kilometres to circulate the fresh oil properly.
You can book an oil change at your local National Tyres branch for professional support with this step.
How to look after your car battery
Your battery is the component most likely to fail when a car sits idle. Here’s how to keep it charged:
1. Start the engine periodically
The best way to keep your battery charged is to start your engine up every so often and let it idle leave for around 20 minutes. This is called idling and this gives the opportunity for the battery to recharge itself.
2. Take the car for a longer drive
For a full recharge, drive for around 45 minutes, ideally on a dual carriageway or motorway. This allows the alternator to replenish the battery properly.
3. Use a trickle charger
If you won't be around to start the car, a trickle charger is a reliable alternative. It plugs into the mains and provides a steady, low-level charge to keep the battery topped up over time.
If your battery is failing, you may need to replace the car battery.
Need help preparing an idle car?
If your car is already sitting unused, or you want to prepare it for storage, National Tyres and Autocare can help. Our services include:
- Engine oil and filter changes.
You can book an appointment online at your local National Tyres and Autocare branch.
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