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FUEL GUAGE UNIT & LED IS TURNING OFF WHEN BATTERY STATUS REACHES 30%

Chairun
Intellectual 360 points
Other Parts Discussed in Thread: BQ40Z50, BQ24735

I AM FROM QMAX ANBU TEAM, USING BQ24735 CHARGER / BQ40Z50 FUEL GUAGE.

I am using 0x0100 chemistry ID for our Project. We sent battery to your lab for testing, to get the chemistry ID. But still we didnt got the ID from your end.

Charger Status is not showing correctly, I am using 0x0073 register to calculate the percentage, SOH register 0x0077 not showing the exact percentage. We are using 4cells to 

Formula I am using to get the percentage = remaining capacity / full charge capacity (using 0x0073 register)

When i switched on the device using power adapter, after battery died --- > Directly its showing 30% battery 

After 100% charge, if i run in battery --> when it comes to 30% means directly it gets switched off.

Batteries also getting heated more, I dont know what happening inside. Can you please guide me, how to read the exact percentage and how to use full battery.(100%)

  • 0
    TI__Guru 73830 points
    the gauge uses the filtered RM and FCC values to calculate SOC. (RM/FCC) The RM and FCC values in the GaugingStatus1 register are unfiltered, so the calculated value will probably be off. You should just read the RelativeStateOfCharge SMB command 0D to get the SOC. SOH is different from SOC and it is calculated from FCC@25C/DesignCapacity.