This data brief introduces the features and characteristics of the STEVAL-ISB013V1 battery monitor demonstration board based on STC3105. These features include accurate battery voltage measurement, Coulomb counter to monitor the battery state-of-charge (SOC), internal 32.768 kHz time base, low-battery alarm output with programmable SOC and voltage thresholds, relaxation timer to track load condition (user-programmable load current threshold), I2C interface for battery monitoring and device control, low power consumption (100 µA in active operating conditions, 50 µA in power saving operating conditions, 2 µA in standby mode, 1 µA in power-down mode) and RoHS compliance.