I am looking for a circuit for a UPS based on one or more 18650 batteries.
The UPS must be capable of delivering 5V at, say, 500mA for, say, 30 minutes. Yeah, specs are a little hazy - and subject to change at my whim and fancy.
What are people using? Off-the-shelf or custom made? Links?
Yes, I’ve Google’d but haven’t found anything useful.
If you’re looking for a power bank/UPS for 5V or USB devices I’d recommend a Pi Juice setup as it can act as a standalone battery pack, solar or UPS-like power storage system.
I’d just go with a standard battery pack or a LiPo/NiMh battery pack with the 5V output you require. You can power a Pi 4 directly from the GPIO so you shouldn’t need more than one battery pack as if it has enough capacity you can simply run both devices in parallel using a splitter or a similar split connection. All the best with your project!
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