1. The pace of the engine crank
2. The power supply to all the electrical components
Modern cars have a special feature where the power that is produced by the battery supplies the electronic components, which include power windows, door locks, wipers, headlights, speaker system, and other small components. When the functionality of these components is reduced, the power of the battery is low.
3. When the battery case swells
The swelling of the battery is one of the surest ways of detecting if there is a problem. Usually, the swelling occurs when there is a sudden chemical reaction that is not expected. The chemical reactions produce a lot of heat in the battery and, therefore, reducing its useful life.