Humble battery pack...
Used a 3-AA battery compartment because 3 1.5v alkaline battery makes up 4.5V, just right for me 5V MuVo. No soldering, just lots and lots of taping.
Smaller form factor than its 4-AA cousin. The DC plug(which I ripped from a car cigarette lighter adapter) has interchangable plugs, which can be used with other appliances as well.
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