A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.

How does a battery work and charge?

A battery works by converting its stored chemical energy into electrical power. Once the electrolyte of the battery is used up, it needs to be recharged. … For example, if a fully charged 4Ah battery is discharged at a 4-ampere rate, then it will take an hour to get fully charged.

How does a charger know when a battery is full?

The battery is fully charged once the current stabilizes at a low level for a few hours. There are two criteria for determining when a battery is fully charged: (1) the final current level and (2) the peak charging voltage while this current flows. … Here, charging is continuous and the peak charge voltage must be lower.