Patent ID: 8082116

Claim:
A method for estimating a life status of a lithium battery, applicable to a portable electronic device, comprising: providing N−1 voltage-electric quantity curves representing characteristics of the lithium battery and sectioning out N lithium battery life status intervals, wherein the N−1 voltage-electric quantity curves are the [(1/N)×M] th , [(2/N)×M] th , . . . , [((N−1)/N)×M] th voltage-electric quantity curves corresponding to available [(1/N)×M] th , [(2/N)×M] th , . . . , [((N−1)/N)−M] th charge-discharge cycles of the lithium battery, the N is an integer greater than zero and smaller than or equal to M, and the M is the available number of charge-discharge cycles of the lithium battery; a control chip measuring an actual voltage and an actual electric quantity of the lithium battery with a time period; and the control chip determining one of the N lithium battery life intervals according to the actual voltage and the actual electric quantity to estimate the life status of the lithium battery.