| 摘要 |
Provided is a battery pack for a portable device to allow a portable device to be used for a long time and to allow a battery to be charged selectively by a fuel cell when the portable device is turned off. The battery pack comprises a first battery pack(120) which is combined with a portable device(110) and supplies an electric power to the combined portable device; a second battery pack(130) which is combined with the first battery pack and supplies an electric power to the combined first battery pack; and a fuel cell pack(140) which supplies an electric power to the portable device and is provided with a circuit part for charging the second battery pack located at the outermost part from the portable device when the portable device is turned off. |
