Battery Charging Warning Light
The charging system is not charging the 12-volt battery, so the car is running on battery power alone.
High risk
The car will keep running only until the battery is flat. Turn off non-essential electrical loads and drive straight to a workshop or a safe place.
Short answer · How far can I drive with the battery light on?
Only a short distance. With the battery light on, the alternator is usually not charging and the car runs on stored battery power, which may last from minutes to about an hour depending on the battery and the loads. Switch off heating, rear window heater and audio, and head straight for help. If the auxiliary belt has broken, power steering and engine cooling may also be affected.
What to do
- Reduce electrical loadSwitch off climate control, seat and window heaters and entertainment.
- Watch other warningsA temperature or steering warning together with the battery light can mean the auxiliary belt has broken. Stop if the temperature rises.A broken belt can also stop the water pump on many engines.
- Drive to help, not homeAvoid stopping the engine: it may not start again.
- Have the charging system testedA workshop tests the battery, alternator output and belt.
How is the light behaving?
| What you see | What it usually means | What to do |
|---|---|---|
| Steady | The alternator is not charging | Reduce load and drive straight to a workshop |
| Flashing | Unstable charging or a loose connection | Have the charging system checked soon |
| On for a few seconds at start-up | Normal check before the engine starts | Nothing |
Possible causes
- Failed alternatorThe alternator or its regulator no longer produces charging current.
- Broken or slipping auxiliary beltThe alternator is no longer driven.
- Loose or corroded cableA bad connection at the battery or alternator interrupts charging.
- Battery faultA failing battery can set the warning on cars with battery management.
Don't confuse it with
Questions about Battery Charging Warning Light
Does the battery light mean I need a new battery?
Not usually. It most often means the charging system has a fault. A test shows whether the battery itself is the cause.
Can a jump start fix the battery light?
A jump start only gets the engine running. If the alternator is not charging, the battery will run flat again.