I went into RadioShack the other day and saw these Enercell portable battery packs on clearance for only $5! That's a great deal, especially at a Brick & Mortar store like RS.

I have a BeagleBone (White) that uses Mini-USB, but aside from that and ancient devices, most of my USB devices use Micro (Would prefer Mini to be honest, I think Micro USB Male headers break too easily). I wanted to mod the battery to make it ANY USB compatible and make a "housing" for it so that the USB female socket wouldn't be hanging around so I made some quick measurements and printed it out!

The funny(weird) thing was the Female USB socket (picked up at RadioShack) was ~$6.99 while the battery was only $4.99 : ) Probably could have picked up the socket online cheaper, but I was there and figured with cost of S&H for a single unit would negate the RS price anways.

Looks like it's about $5.99 at amazon:
http://www.amazon.com/Enercell-Power-800mAh-Charger-2300218/dp/B008KPQTW0/ref=sr_1_3?ie=UTF8&qid=1373906604&sr=8-3&keywords=enercell+portable+USB

Pried the case apart (no Screws) the Mini USB header slid right out of the housing, and just used wire cutters to cut the GND and 5V PIN.

Printed out 1 of each, soldered it up quick, and super glued the pieces together.