Journal · 4 min read · 20 May 2026
Leaving your car parked for the summer — what happens to the battery?
Travelling for weeks? Parked cars slowly drain their batteries, and heat speeds it up. How to prepare, and what to do when you return to a flat battery.
The short answer
A parked car draws a small current for alarms, keyless entry and control units, and heat increases a battery's self-discharge. Over several weeks, a healthy battery may go flat and a tired one may be damaged. Test the battery before you leave, and consider a maintainer, a trusted driver, or — where appropriate for the vehicle — disconnection.
Why a parked car goes flat
Modern vehicles are never fully off. Alarm systems, keyless entry receivers and control modules draw a small current around the clock. On electronics-heavy vehicles that draw is higher. Add Dubai summer heat — which increases self-discharge — and a battery can run down within weeks.
Deep discharge also damages lead-acid batteries. A battery left flat for a long period may never fully recover.
Before you travel
- Test the battery. If it is already weak, replacing it before you leave is far easier than dealing with a dead car on return. See battery testing.
- Park in shade or underground.
- Arrange a drive. Someone running the car for a proper drive every week or two helps.
- Consider a maintainer if you have access to a socket in your parking space.
- Disconnection can work on simpler vehicles, but on many modern cars it resets settings and may affect alarm or keyless functions. Check your vehicle first.
When you come back to a flat battery
- A jump start may get you going, but the battery should then be tested and properly charged.
- If the battery has been deeply discharged for weeks, replacement is often the reliable fix.
- Vehicles with battery monitoring may show warnings until the battery recovers or is replaced and registered.
Updated 18 October 2026