The invention discloses a rechargeable battery, which comprises a shell, a voltage conversion module, a charging module and a charging interface, wherein the shell is provided with a positive terminaland a negative terminal; a power storage module is arranged in the shell and includes but is not limited to a lithium-ion battery, a lithium-ion polymer battery, a nickel-metal hydride battery and anickel-cadmium battery; one end of the charging module is electrically connected with the charging interface and the other end of the charging module is electrically connected with the power storage module; and one end of the voltage conversion module is electrically connected with the positive terminal and the negative terminal and the other end of the voltage conversion module is electrically connected with the power storage module. The rechargeable battery can directly replace an existing non-rechargeable battery to be applied to electrical equipment, and a user does not frequently replacethe battery any more, so that the rechargeable battery is simple in operation, convenience is brought for the user, the rechargeable battery can be applied to an electric appliance without changing the design of an electric appliance product and the production and improvement cost is reduced.