Symptoms of a discharged battery
The following symptoms (these are just a few examples) may indicate that the battery is completely discharged or is at the end of its useful life.
- The brightness of lights changes when the accelerator is pressed.
- The direction indicator blinking time becomes longer.
- The starter motor becomes too weak to start the engine.
End of useful life
- The specific gravity of electrolyte in each battery or the terminal voltage drops.
- The difference in electrolyte levels or specific gravity between batteries grows larger.
- Battery electrolyte levels drop significantly and need to be refilled more often.
Advice: These cars have a higher likelihood of having a discharged battery.
Beware of these cars!
Cars that are not used much*
Cars that are mostly operated at night
Cars that have many extra electronic accessories
Cars with batteries that are more than three years old
- Even when a car is not used, it generally consums 10 to 30 mA, and the battery will be dead in one to three months.