Battery resistance measuring method, battery power managing method and electronic device using the method

A battery power managing method, applied to a battery with a battery resistance, comprising:

• (a) acquiring charge variation of the battery for a measuring time interval;
• (b) acquiring a voltage difference between a first battery voltage and a second battery voltage for the measuring time interval, wherein the first battery voltage is a battery voltage with loading and the second battery voltage is a battery voltage without loading;
• (c) computing a battery resistance according to the charge variation and the voltage difference, and updating the battery resistance to a battery resistance table of the battery;
• and
• (d) managing the battery power according to the battery resistance table;
• wherein the battery voltage with loading means a battery voltage when the electronic device with the battery is active or is using at least one application;
• wherein the battery voltage without loading means a battery voltage when the electronic device with the battery is in a non-active state or in a sleep state.

An electronic device, comprising:

• a battery;
• and
• a processing circuit, configured to perform following steps:
• (a) acquiring charge variation of the battery for a measuring time interval;
• (b) acquiring a voltage difference between a first battery voltage and a second battery voltage for the measuring time interval, wherein the first battery voltage is a battery voltage with loading and the second battery voltage is a battery voltage without loading;
• and
• (c) computing a battery resistance according to the charge variation and the voltage difference, and updating the battery resistance to a battery resistance table of the battery;
• wherein the battery voltage with loading means a battery voltage when an electronic device with the battery is active or is using at least one application;
• wherein the battery voltage without loading means a battery voltage when the electronic device is in a non-active state or in a sleep state.