Rechargeable battery

A rechargeable battery, which can prevent incompatibility of rechargeable batteries with existing charging/discharging equipment by extending an electrode terminal to the center of a cap plate. In one embodiment, the rechargeable battery includes an electrode assembly including a positive electrode tab and a negative electrode tab, a can accommodating the electrode assembly, a cap plate sealing a top opening of the can and having a terminal through-hole at a first location offset toward one side of the cap plate with respect to the center of the cap plate, and an electrode terminal inserted into the terminal through-hole, wherein the electrode terminal extends along a top surface of the cap plate from the first location to the center of the cap plate.