An invention is provided for a dynamic interactive content system. The battery charging apparatus has a serial communication unit which receives battery residual capacity information, detected by the ink jet printer, from the ink jet printer, and a display unit which displays a battery residual capacity based on the residual capacity information received by the serial communication unit. The at least two pass through ports provide redundant operation of the multiple data storage library system to ensure media cartridge transportability between the first and second storage libraries in the event that one of the at least two pass through ports should become inactive.