Electronic device with low battery warning

A video camera system, comprising:

• a video camera body;
• a battery pack including a battery having at least one battery cell;
• and
• a communications line connected to said video camera body and said battery pack;
• said video camera body including:
• a processor that obtains a capacity value of said battery by communicating with said battery pack over said communications line, 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.

A battery pack for a video camera system, said battery pack comprising:

• a cell structure section including at least one battery cell and having at least one stage;
• a power terminal that supplies power to a video camera body of the video system over a power source line;
• a memory that stores a capacity value of said battery in association with a type of said battery pack, the capacity value indicating a number of battery cells in said battery, the type of the battery pack being based on the capacity value;
• a communications terminal that provides a connection to a communications line connected between said battery pack and the video camera body;
• and
• a processor that provides the capacity value stored in said memory to the video camera body using said communications terminal and the communications line;
• said video camera body thereby determining a residual power amount of the battery based on the capacity value, setting a correction value based on the provided capacity value, correcting a low power warning voltage value by subtracting the correction value from a low power warning voltage value, detecting a battery voltage of said at least one battery cell, generating a low power warning in response to the detected battery voltage being less than or equal to the corrected low power warning voltage value, generating 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 displaying the low power warning or the residual power amount.