Waveshare 25567 For Raspberry Pi UPS HAT (D), Pogo Pins Connector , Without Battery Features: 1. Adopt pogo pin connector design, compatible with Raspberry Pi 3 3B+ 4B, etc. 2. Onboard lithium battery charging chip, with dynamic path management, more stable power supply 3. Onboard boost converter chip provides stable 5V power output 4. I2C bus communication, real-time monitoring of battery voltage, current, power, and remaining power 5. Multiple battery protection circuits: overchargedischarge protection, overcurrent protection, short circuit protection, safer and more stable 6. Onboard MCU management, supports detecting power connection and starting Raspberry Pi 7. Supports displaying battery power on the system to facilitate checking the remaining battery power. 8. Onboard LED indicator for monitoring battery working status Product parameters: 1. Output voltage: 5V 2. Control bus: I2C 3. Battery: 21700 lithium battery × 2 (connected in parallel, batteries are not included in delivery) 4. Charger support: 5V (Type-C port) 5. Product size: 56 x 85mm 6. Mounting hole size: 3.0mm Packing list: -UPS Hat (D) x 1 -Acrylic protective board x 1 -Screw pack x 1