A charger is an electronic device designed to replenish the energy stored in rechargeable batteries or devices. Its primary purpose is to supply electrical power to these batteries, enabling them to regain their charge and be ready for use. Chargers consist of various components that work together to efficiently transfer electrical energy from a power source, such as an electrical outlet or a USB port, to the battery of the device being charged. They typically include a plug or connector that attaches to the power source and a cable or wire to transmit the energy.

The charger also includes circuitry and control mechanisms that manage the flow of electricity to prevent overcharging and ensure safe and optimal charging. Depending on the type of battery and device being charged, chargers might have different voltage and current specifications. Fast chargers, for example, are designed to deliver higher currents to expedite the charging process, while standard chargers provide a slower and more gradual charging experience. Chargers are an essential part of our daily lives, allowing us to keep our devices, such as car and boat batteries, smartphones, laptops, and tablets, powered and operational.