Features: Activate the built-in battery: connect the small board to the power-supply, button the battery directly on the corresponding card buckle, and press the activation button to activate. Built-in battery charge or activation: first connect the small board to the power-supply, then the battery can be charged by fastening on the activation board. Easy to use and high efficiency. Compact size for easy carrying and storage. Suitable for most mobile phones. Intelligent recognition, accurate detection, one-button-start, overload protections and automatic power-off.