wall transformer for project power supplyhttp://www.instructables.com/id/EQ3VVA5ZVKEYF7HZ0W/
Reuse "Wallwart" transformershttp://www.instructables.com/id/EC1BYG2K40EWPKHAGV/
in a perminant way.
How to solderhttp://www.instructables.com/id/E30LR180T4EWP872BS/
Soldering to large metal objectshttp://www.instructables.com/id/EYUBQBN818EWZMIAYA/
if you are lazy like me and decide to solder onto the large battery clips rather than fiddle with the wires inside the case. or, you can't find your soldering gun but can find your butane torch...
you could even use
Handy box from scratch paperhttp://www.instructables.com/id/EZO32EAKLOEXCFECUK/
and, yes, i screwed up the batteries before i had a chance to use
Revive Nicad Batteries by Zapping with a Welderhttp://www.instructables.com/id/EPV474YLF3EV2Z8V9V/
Hot Rodding a Power Drill Batteryhttp://www.instructables.com/id/EZOAB2A75XEV2ZHAQP/