Abstract: A device (10) is provided for electrically recharging the internal battery of a cellular telephone (20). The device (10) has a casing (11) containing power and current-transforming electronic components, a unit (13) for connecting to an external current source, of mains type, and a unit (14) for connecting to said cellular telephone. The device also includes a backup battery incorporated in the casing intended, on the one hand, to recharge the battery of the cellular telephone (20) when the device (10) is linked only to the latter and, on the other hand, to be recharged when the device (10) is linked at least to the external current source.