Quick Overview : 

• Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
• Onboard ATmega328P MCU, supports Arduino programming
• Onboard PCF8523 RTC chip, provides precise RTC information
• Onboard CP2102 UART converter, for UART communication or ATmega328P programming
• User-defined button, can be used for Raspberry Pi start up, safely shutdown, or other customized function
• Protection circuits such as: power supply anti-reverse, counter current proof, etc. ensures stable and safe operating
• Voltage/current monitoring circuit, monitors the Raspberry Pi operating voltage and current in real time
• Comes with development resources and manual

How to use : https://www.waveshare.com/wiki/Power_Management_HAT

The Power Management HAT is a smart power bank designed for Raspberry Pi. With the embedded Arduino MCU and RTC, the HAT features auto power management function which allows the Pi to work more power-efficient and more safely.

If you're looking for some convenient utilities for yor long-term working Raspberry Pi, such as longer battery life, or auto power on-off control, this Power Management HAT would be the ideal choice.

By auto starting up on specified period, and auto shutdown at other time, the HAT can greatly save the battery life. It will monitors the operating voltage/current status of the Raspberry Pi in real time, and can be configured to shut the Pi down according to the operating status. What's more, it comes with a handy power switch for easy on or off (safely shutdown the Pi by software), to avoid data loss caused by unplugging the power supply.

Package Includes : 

• Power Management HAT x1
• 18650 battery case x1
• USB-A to USB micro B cable x1
• 2x20PIN female pinheader x1
• RPi screws pack (2pcs) x1

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