Patent ID: 8284302

Claim:
A video camera, comprising: a processor that obtains a capacity value of a battery by communicating over a communications line with a battery pack that contains the battery, the battery providing power to the video camera, the capacity value indicating a number of cell structures in the battery, determines a residual power amount of the battery based on the capacity value, sets a correction value based on the capacity value, determines a type of the battery pack based on the capacity value, stores in a memory the correction value in association with the type of the battery pack, corrects a low power warning voltage value by subtracting the correction value from the low power warning voltage value, generates a low power warning in response to a detected battery voltage being less than or equal to the corrected low power warning voltage value, and generates a display of the residual power amount in response to the detected battery voltage being greater than the corrected low power warning voltage value; and a display that displays the low power warning or the residual power amount.