Supercaps would be the cool, but I was originally thinking of using something like this:
http://www.ianker.com/product/79ANS1052-BA.
Should I send this as a separate proposal?
Pros:
- Only needs to be replaced/recharged every few matches, in case one forgets.
- Totally isolated power supply
- Technically very easy (plug into RPi and you're done, use the other port for whatever USB peripherals you need)
- Much lighter than a laptop
- Should be quite safe, with unmodified COTS cables
Cons:
- Not as cool or fun as SuperCaps
- Obviously needs to be exempted from R34