https://gist.github.com/JChristensen/10470affa2ec984d4cac7ef70f16b7c2
Jack Christensen
May 2021
I recently purchased a PowerBoost 1000 and a 2500mAh LiPo battery from Adafruit to use as a small uninterruptible power supply (UPS) for a Raspberry Pi.
From a little testing, I could tell that the setup would power a Pi Zero W for quite some time, but I wasn't sure how long. Christopher Barnatt's recent Explaining Computers video inspired me to find out.
I set up a Pi Zero W as a headless machine with the latest version of Raspberry Pi OS Lite (04Mar2021).