Patent ID: 6967890
Filing Date: 2005-11-22
Classification: G06F,G11C

Abstract:
1. A battery power measuring system for a Battery-Backed SRAM (Static Random Access Memory), comprising: a nonvolatile memory for storing a system time, an estimated battery maximal endurance, an estimated battery minimal endurance, and a cumulative on-battery run time; a clock for indicating a current system time; a CPU (Central Processing Unit) for calculating a new cumulative on-battery run time based on a former system time, the estimated battery maximal endurance and a former cumulative on-battery run time, and for calculating a remaining battery endurance according to the estimate battery maximal endurance and the new cumulative on-battery run time; and a buzzer for reminding one or more users to replace a battery when the remaining battery endurance is lower than the estimated battery minimal endurance.