Were you to want to, you'd have much much more space and could just convert a lot of the body to li-ion which is probably a better use than really trying to get

Were you to want to, you'd have much much more space and could just convert a lot of the body to li-ion which is probably a better use than really trying to get it last that long on AAs. (Also there are probably better processors, unless you really need the graphics performance (though not all the time of course), it really is true that the RPi is a GPU with a CPU accessory, shame it is so hard to do compute with the GPU) Anyways for your needs I'd look at the CHIP, which is much like the rPi 0 except it has WIFI and BT connectivity, plus built in power control and charging circuitry (and costs $9 (or $8 if you are fast)) [1] A hackish job is probably possible, the hard part would be sourcing the display. [1] http://makezine.com/2015/11/28/chip-vs-pi-zero/ http://makezine.com/2015/11/28/chip-vs-pi-zero/