Jump start or new battery? How to tell

When your car will not start, the first question is usually: do I need a jump start, or a new battery? The answer depends on why the battery is flat.

A jump start fixes a flat battery

A battery goes flat when more energy is taken out than is put back. Common causes:

• headlights, interior lights or a charger left on,
• the car parked for weeks without being driven,
• a short trip after a long stop, with heavy AC use.

If the battery itself is healthy, a jump start gets the engine running and the alternator recharges the battery as you drive.

A new battery fixes a worn-out battery

A worn-out battery, often damaged by heat, age or the wrong technology, can no longer hold or deliver enough charge. A jump start may get you going, but the car will fail to start again, often the next morning.

How to tell the difference

Sign	Probably just flat	Probably worn out
Cause	Something was left on	Nothing obvious
History	First time	It keeps happening
Before today	Starting normally	Slow cranking for days or weeks
Battery age	Under two years	Two to three summers or more
Battery case	Looks normal	Swollen, leaking or corroded

The only way to be sure is to test the battery once the car is running. A test measures how much starting power the battery has left.

Jump-starting a modern car safely

Modern cars are full of electronics, and a careless jump start can damage them.

1. Check the manual. Many cars have dedicated jump-start terminals under the bonnet, even when the battery is in the boot or under a seat. Use them.
2. Never jump-start a damaged battery. If it is swollen, cracked, leaking or smells of sulphur, do not connect anything.
3. Connect in the right order. Positive to positive first, then negative to a bare metal earth point or the specified negative terminal, away from the battery.
4. Prefer a booster pack. A professional booster pack avoids the voltage spikes that can come from connecting to another running car.
5. Drive afterwards. Give the battery at least 30 minutes of driving to recharge.

When to call for help

Call a professional if you are not comfortable doing it yourself, if the car has a complex electrical system, or if the battery may be damaged. Our jump start service includes a battery test. If the battery has failed, we can replace it on the spot through our emergency battery replacement.

If you decide to replace it, see what a new car battery costs in Dubai.