Battery with open bottom

Disclosed is a battery with an open bottom, comprising a battery assembly and an electrolyte storage box for accommodating an electrolyte. Said battery assembly comprises at least one battery pack, and said at least one battery pack can move between a first position and a second position relative to said electrolyte storage box; in the first position, said at least one battery pack contacts said electrolyte so as to enable said battery with an open bottom to generate electricity, and in the second position, said at least one battery pack is separated from said electrolyte such that said battery with an open bottom is turned off. The battery pack of the battery with an open bottom in the present invention can move between the first and the second positions relative to the electrolyte storage box so as to rapidly contact and react with the electrolyte.