A rechargeable battery pack may be used with a protection circuit module in common for serial or parallel connection of unit cells. The rechargeable battery pack may include a plurality of unit cells for forming a rechargeable battery by providing an electrode assembly to a pouch, a protection circuit module electrically connected to the unit cells, and a connector connected to the protection circuit module. The protection circuit module may include a serial protection circuit for electrically connecting the unit cells in series and a parallel protection circuit for electrically connecting the unit cells in parallel.