Charging device, electronic device, battery remaining amount display control method in charging device, battery remaining amount detection method in electronic device

摘要

According to one aspect of the invention, a battery charging apparatus including a battery pack, which is attachable/removable to/from an ink jet printer which can be driven with electric power from the battery pack. 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.