Further to my suggestion/request about a mini inline UPS for the Pi4 I have stumbled upon a decent workaround for now until sidehack has time to get one designed etc (no rush sidehack
).
I'm using a Voltaic V25 USB powerbank. It has Type C input so can be used with the Raspi power supply, so all you need is a good quality Type A to Type C cable to connect the powerbank to the Pi.
I fully charged it and connected it to my Pi4, restarted it and it ran no problem. Waited until cgminer had plateaued all Gekko devices (6x Newpacs, 1x R606) and then unplugged the input/charge cable from the powerbank.
So far its been running for 57mins and has used 2 out of 4 indicators, so approximately 50% of the capacity.
For me the power never really gets cut here for more than 30mins. Its usually due to the main trip switch going thanks to a bulb blowing. This thing lasting over an hour is pretty darn good, especially when I have a wireless Rii RT518 Keyboard and 7" IPS HDMI screen being powered from the Pi aswell.
Just thought this info may be useful so some of you.