I would not connect a Fire directly to a battery.   Consider the step-down DC-DC used on the Tobi: http://www.ti.com/lit/ds/symlink/tps62110.pdf.

The wiki  has links to some battery options:   http://wiki.gumstix.org/index.php?title=Category:How_to_-_batteries

Greg




From: Nick Starzicki <nick2501@gmail.com>
To: General mailing list for gumstix users. <gumstix-users@lists.sourceforge.net>
Sent: Monday, November 28, 2011 3:31 PM
Subject: [Gumstix-users] powering the gumstix overo fire

Hi
 
I would like to power my gumstix overo fire using a battery.
The gumstix needs a stable 5V of what I know, so I was wondering if I have to use some kind of regulator for stable voltage or has anyone found a good enough battery pack?
 
Thanks
 
Nick

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