Battery Charging Supports fast battery charging with a capacity of 3000mA Battery charging control can be managed via GPIO Provides protection against battery overcurrent and overvoltage. Built-in protection against reverse connection of battery cells Integrated 's fuel-gauge systems for reading battery voltage and percentage over i2c On-board LEDs indicate battery charging and discharging levels of 25%, 50%, 75%, and 100% Features a 2-cell 18650 battery holder (Battery not included) Enhanced Power Management Seamless power switching between backup power and power adapter On-board push button performs the same actions as the Pi's power button Automatically cuts off power when the Pi is shut down On-board LED indicates power status and Pi detection AC power loss and power adapter failure detection via GPIO Auto power-on when power is applied or restored Automatic safe shutdown when battery voltage is low (programmable) Ultra-low standby power consumption to maximize battery life Advanced system power-path management to minimize frequent charging and discharging of batteries Power input: 5Vdc 5A via USB Type-C / XH2.54-2P connector UPS output: 5.1V 5% Max 5A Battery charging current: Max 2.3-3.2A Terminal Battery Voltage: 4.23V Battery Recharge Threshold: 4.1V Ports & Connectors: USB Type-C socket 18650 battery socket x2 5V Power output connector x2 - XH2.54 2-pin External power button connector x1 - XH2.54-2P PCB Size: 106.6mm x 85mm NOTE: Not include 5 & 18650 Batteries & cooler!!! Color: As Shown Material: Electronic Component Package Contents: 1 * Power management expansion board 1 set * accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.