How To Check A Car Battery
A simple voltage check and a look at the terminals tell you a lot about the battery’s state before it leaves you stranded.
DifficultyEasy
TimeAbout 10 minutes
AreaBattery and electrical
What you need
- MultimeterSet to DC volts.
- TorchFor the terminals.
Step by step
- Let the car standIdeally for a few hours, so the reading is not affected by charging.
- Measure across the terminalsRed probe on positive, black on negative.Do not let metal tools touch both terminals at the same time.
- Read the voltageAround 12.6 V means a healthy, charged battery; much lower means it is discharged or weak.
- Measure with the engine runningUsually around 13.5–14.5 V, meaning the alternator is charging. Some cars use smart charging, so values vary.
- Inspect terminals and caseLook for corrosion, loose clamps, cracks or bulging.
When to go to a workshop
A load test at a workshop shows whether the battery can still deliver starting current. Have the charging system checked if the battery light comes on.
Questions about How To Check A Car Battery
How long do car batteries last?
Usually several years, depending on climate and driving.
Can I charge it at home?
Yes, with a suitable charger; follow its instructions and the car manual.