Rechargeable battery pack for supplying electrical energy to hand-held power tools, preferably electrically powered gardening and/or forestry tools, wherein the rechargeable battery pack is configured for selective use in a vertical, preferably worn on the back, use position (V) or a horizontal, preferably docked on a tool, use position (H) and comprises the following: - an external housing which comprises a housing base and a housing hood connected to the housing base and which surrounds an interior space , and - a rechargeable battery cell block which is arranged in the interior space, characterized by - a water discharge structure for discharging at least one of water contained in the interior space and water which enters the external housing from outside, wherein - the water discharge structure comprises, on at least one side of the external housing , a double-labyrinth wall structure which is open to liquid and has an outer labyrinth wall structure , which is formed by overlapping of an outer side wall of the housing base and an outer side wall of the housing hood , and an inner labyrinth wall structure , which is arranged offset in relation to the outer labyrinth wall structure in a direction (VR) facing the interior space and which is formed by overlapping of an inner side wall of the housing base and an inner side wall of the housing hood , respectively, and/or - the water discharge structure comprises a labyrinth wall structure which is open to liquid and, in the vertical or the horizontal use position (V, H) of the rechargeable battery pack, is formed, in a manner leading in a direction downwards and to the outside, between an electrical plug-in connection body , which is arranged on the side of the housing base , and a corresponding tool connection plug in a plugged-in position. - an external housing which comprises a housing base and a housing hood connected to the housing base and which surrounds an interior space , and - a rechargeable battery cell block which is arranged in the interior space, - a water discharge structure for discharging at least one of water contained in the interior space and water which enters the external housing from outside, wherein - the water discharge structure comprises, on at least one side of the external housing , a double-labyrinth wall structure which is open to liquid and has an outer labyrinth wall structure , which is formed by overlapping of an outer side wall of the housing base and an outer side wall of the housing hood , and an inner labyrinth wall structure , which is arranged offset in relation to the outer labyrinth wall structure in a direction (VR) facing the interior space and which is formed by overlapping of an inner side wall of the housing base and an inner side wall of the housing hood , respectively, and/or - the water discharge structure comprises a labyrinth wall structure which is open to liquid and, in the vertical or the horizontal use position (V, H) of the rechargeable battery pack, is formed, in a manner leading in a direction downwards and to the outside, between an electrical plug-in connection body , which is arranged on the side of the housing base , and a corresponding tool connection plug in a plugged-in position. <EOS>