This is a simple 52Pi UPS Plus tutorial for you, it will show you the basic usage of the UPS Plus, which SKU is EP-0136, you can get this wiki from:
* Wiki: https://wiki.52pi.com/index.php?title=EP-0136
* Product: https://52pi.com/products/52pi-ups-board-with-rtc-coulometer-for-raspberry-pi