Patent ID: 8035397

Claim:
A mobile terminal comprising: a system adapted to: i) measure a battery voltage of a battery of the mobile terminal at a no-load condition to provide a no-load battery voltage; ii) measure the battery voltage of the battery at a full-load condition during a first transmit burst to provide a full-load battery voltage; iii) measure a current provided from the battery to power amplifier circuitry in a transmit chain of the mobile terminal at a full-load condition during the first transmit burst to provide a full-load current; iv) determine a battery resistance based on the no-load battery voltage, the full-load battery voltage, and the full-load current; and v) provide the battery resistance as an indicator of remaining battery-life for the battery of the mobile terminal, wherein the system is further adapted to measure the battery voltage prior to ramp-up for the first transmit burst to measure the battery voltage at a no-load condition.