Unfortunately the Pi, will draw a hell of a lot of current which would make running on batteries difficult, the esp8266 (an MCU with Wifi support) apparently draws at peak 300mA @ 3.3V.
I've just been playing about with nodemcu (which is eLua ported to the esp8266) on them, whilst also seeing how long it will run for on 2x 18650 3400mAh batteries.
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Unfortunately the Pi, will draw a hell of a lot of current which would make running on batteries difficult, the esp8266 (an MCU with Wifi support) apparently draws at peak 300mA @ 3.3V.
I've just been playing about with nodemcu (which is eLua ported to the esp8266) on them, whilst also seeing how long it will run for on 2x 18650 3400mAh batteries.