Originally Posted by ken cummings
Among other places RadioShack sells plastic cases with the clips, springs, and wiring to make battery packs. I have seen AAA to D sizes.
If you use the radio shack battery cases, particularly the multi cell ones, the batteries will pop out at inconveniant times. I finally used some sheet styrene on each side of the case, held in place with a pair of zip ties to keep the batteries in. Also, if you use the nine volt battery style connectors, get the heavier duty ones. The cheap ones just can't handle much handling.