It is described an electrical connection device between a battery (50) and an electrical motor of a mower (1), wherein electrical conductive means (503) belonging to the battery (50) selectively connect to respective electrical conductive means (106) of the mower (1) connected to the electrical motor. The battery (50) is provided with cam means (505), controlled by a lever (507), adapted to interact with pins (110) opposed by elastic means (111) housed within a compartment (103) of the body (10) of the mower (1), so as to make the battery (50) take a lock position wherein the battery (50) is electrically connected to the electrical motor of the mower (1) and a release position wherein the battery (50) is electrically disconnected from the electrical motor of the mower (1).
