The conrad energy box is designed for 36 batteries or rechargeable batteries it can store 18x aa 14x micro and 4x 9 v block certainly and practically with the conrad energy box you have at home and also on the way always your most current batteries or rechargeable batteries ready and must not look long you can fasten the box also on the wall and the batteries or rechargeable batteries are protected by the stable lid with spring fastener also from dust and humidity the built in battery teste