Stop in a gun shop with one of your AA cells and check out the selection of cartrige boxes used for reloads. The .45cal should work, --but they come in 50 and 100 cartrige sizes. Rifle cartidge boxes come in 20 round size and would be perfect. When depleted, just put + side down. When charged, put + side up. Number and lable your cells so you use them in pairs or quads and discharge and charge these at the same time. I use the little 4 cell plastic boxes to store and transport mine.