Part Number:BQ27421-G1
I'm using the bq27421-G1A in a handheld device to supervise state of charge and state of health aqnd battery voltage of an LiPo Battery.
nominal capacity is 750mAh, maximum Voltage 4.2V
The following design parameters are used:
Design Capacity: 750
Design Energy: 2775
Terminate Voltage: 3500
Taper Rate: 1125
Yesterday I've measured battery voltage and SoC during discharge (average discharge current was approx. 150mA). I've startet at 4.157V / 97% and stopped at 3.716V / 43% yesterday evening. Today I wanted to continue the measurment. The Voltage was still at 3.714V but SoC has fallen to 18% over night (within 16 hours). The standby current of the device is below 1mA.
After discharging downto 3.6V, I've started charging again with 500mA. After 80 minutes the voltage was at 4.19V but SoC only 73% - should be almost 100% at this state.
Any Idea, what causes this curious behaviour?
BR jde
