USAGE BASED LOW BATTERY INDICATION METHOD AND SYSTEM
Publication Date: 2004-Jun-23
The IP.com Prior Art Database
The invention relates to a method for determining the coulomb consumption and remaining coulomb capacity of a battery. The method starts with the coulomb capacity of the battery at the time of manufacture and subtracts off the coulombs that are consumed over the life of the battery. Determination of the coulomb consumption is accomplished by tracking the mode of operation, the duration of the time in that mode, and the temperature of the device at time of operation. From the known temperature-dependent characteristics, a nominal temperature-corrected coulomb consumption is computed. The remaining life of a battery is determined by subtracting the accumulated coulomb consumption from the initial battery.