Construct A Higher Battery % Our every is (four) of the blue plastic “D” Cell phone modular battery holders, approx three-three/eight” x 1-7/sixteen” x 1-1/eight” deep with out tabs. They slide in combination all sides-to-facet or finish-to-finish or any aggregate of each, with connecting tabs in each instructions. Can also be stressed parallel or in collection. Open tops. Fascinating chances.