Characteristic tracking method and circuit for a battery module

A characteristic tracking circuit for a battery module comprising at least one battery, comprising:

• a current accumulation circuit obtaining a real capacity according to usage of the battery module;
• a voltage measurement circuit measuring the battery to obtain a first voltage;
• and
• a control circuit utilizing the measured first voltage to locate a table capacity from a look-up table, and updating the look-up table according to the real capacity and the table capacity, comprising:
• a determining module determining whether a preset condition has been satisfied, wherein when the preset condition has been satisfied, the determining module activates the voltage measurement circuit to measure a present open circuit voltage of the battery to serve as the measured first voltage.