Using Raspberry Pi for Pihole Ad Blocking and Network UPS Tools
Amazon.com: MakerFocus Raspberry Pi 4 Battery Pack UPS, RPI Pack Standard 10000mAh Raspberry Pi Battery USB Pack Raspberry Pi Latest Version V3Plus Expansion Board Power Supply Type-C for RPI 4B 3B+ 3B
Using Raspberry Pi for Pihole Ad Blocking and Network UPS Tools
Automated UPS Monitoring for vSphere with NUT and Raspberry Pi (Cheap!) - Stephen Foskett, Pack Rat