Flexible cordless pump with 2 functions: can be used always and everywhere as immersion pump or rain barrel pump. For environmentally-friendly garden irrigation with rain water or pumping out of clear water from containers, water basins and flooded cellars. Fast retrofitting from rain barrel pump to clear water immersion pump thanks to tool-free removal of the pump base. Low-intake level up to a residual water level of 1-2 mm. External battery pack box for protection of the battery pack from moisture, can easily be fixed to the wall or containers.