A case battery with storage device is provided. The case battery comprises first and second holding portions, a charging portion, and storage devices. The first holding portion is configured to hold a first part of the personal electronic device. The second holding portion is configured to hold a second part. The charging portion is disposed in the first base plate of the first holding portion. The storage devices are disposed in one of the first base plates of the first and the second base plates of the second holding portions. The first and second holding portions are configured to enclose and hold at least part of the personal electronic device and provide additional electrical power and memory capacity to the personal electronic device.