PwrMini P1 0-Latency UPS for Mac Mini M4
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Losing power just as you are getting serious work done on your Mac Mini is not idea. The PwrMini P1 is a 0-latency online UPS that protects your computer in case of a power outage. It is designed to work with macOS without relying on drivers or special software. It provides you with up to 8 hours on battery. P1 has an aerospace alloy construction, so it matches the design of your Mac.

The P1 uses a silent drive airflow system for cooling. It is smart enough to enable a graceful shutdown when you are running low on battery. The makers use 21700 cells. They are also introducing an extension dock with USB, mini DP, DP, SD card, and TF card reader. You can find this project on Kickstarter.
[where to get it]