Patent ID: 8473231

Claim:
A mobile device comprising: a rechargeable battery; and a battery monitoring system configured to monitor charging information, discharging information and storage information of the battery, the charging information including a number of charge cycles incurred by the battery, the discharging information including a number of discharge cycles incurred by the battery, and the storage information relating to periods when the battery is not being actively charged or discharged; the battery monitoring system being further configured to approximate an extent of deterioration of an equivalent series resistance (ESR) of the battery based on the stored charging information, discharging information and storage information; the battery monitoring system being further configured to display a graphical representation of the deterioration of the ESR, wherein the graphical representation includes a status bar indicating ESR, an indication on the status bar of the approximated deterioration of the ESR, and a line on the status bar representing a threshold ESR.