Great to see LTT in this space, you're well positioned for it (access to a variety of hardware.) Would love to see a more developed experiment design.

Would love to see how the waveform changes over load -- perhaps test at 0, 10, 20, 40, 80% load.

Also, how does waveform vary as the battery depletes?

Another metric is how capacity varies with load. If a UPS gives me 1 hour @ 100w, will it give me 10 hours @ 10w? How long will it power an idling rpi5 (<1w)? How long will it give my workstation PC?