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Re:PiPhone – A Raspberry-Pi-based Smartphone by pepijndevos on Friday April 25, 2014 @12:06PM (#7647318)
As someone who has built an MP3 player with the RPi, I can tell you that the RPi is NOT made to run of a battery.

http://pepijndevos.nl/2013/11/21/raspberry-pi-mp3-player.htm...

The 2200Mah battery will only last a couple of hours.

Re:PiPhone – A Raspberry-Pi-based Smartphone by xnbya on Friday April 25, 2014 @01:06PM (#7647698)
The network / usb chip takes quite a bit of power relatively, so the model A could last a bit longer on the 2200ah battery