After purchasing cordless drills, saws, weed trimmers etc. one accumulates many 18 volt batteries and chargers--all of which end up consuming flat workspace. This instructable provides a way to move those batteries and chargers onto the wall.
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Make measurements and design a box using Autodesk 123d--or copy my files:
Print the file with a 3d printer and hang the box on the wall using a wood screw.
Note that this is a 10 hour build on a Makerbot Replicator. You could build the same thing much more rapidly using plywood--but that's an individual choice.
Here's what it looks like with the battery and charger in place.