Patent ID: 7773147

Claim:
A method for predicting a quantity of pictures that can be taken for a digital still camera using a proprietary battery, comprising: building a lookup table, wherein the lookup table includes a power consumption column, a battery discharging power column, and a picture-taking quantity column for recording a relationship between a battery voltage value and a quantity of pictures to be taken, wherein the quantity of pictures to be taken stored in the picture-taking quantity column is determined by calculating a ratio between a power consumption value stored in the power consumption column and a power discharging value stored in the battery discharging power column; obtaining the battery voltage value of the digital still camera and looking up the lookup table to determine whether the battery voltage value obtained is recorded in the lookup table; and if the battery voltage value obtained has been recorded in the lookup table obtaining the quantity of pictures to be taken from the picture-taking quantity column associated with the batter voltage value, or otherwise updating the lookup table according to the battery voltage value.