1、Based on for Raspberry Pi 40pin GPIO interface, suitable for Raspberry Pi series motherboards. 2、It can communicate through the I2C interface to measure parameters such as battery voltage, current, power and remaining power, and detect the working status of the module in real time. 3、The onboard battery protection circuit can prevent overcharge, overdischarge, overcurrent, short circuit and reverse connection, balanced charging, stable work and safer. 4、Onboard 5V voltage regulator chip, up to 2.5A continuous output current. 5、The onboard USB interface can output 5V power, which is convenient for powering other main control boards. 6、The onboard warning indicator is convenient to check whether the battery is connected reversely. Condition:100% Brand New Item Type: UPS HATOutput Voltage: 5V Charging Power Supply: 8.4V2A Control Interface: I2C Size: Approx. 56 x 85mm/2.2 x 3.3in Battery Specification: 18650 lithium battery (not included) Through Hole Diameter: Approx. 3.0mm/0.1in Battery Capacity: 2 x 5200mAh 1 x UPS HAT 1 x Power Adapter 1 x Long Row Base 1 x Screw Pack