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bq27421-g1 (remaining capacity and full charge capacity errors)

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Dear contributors,

We have currently an issue with this following gauge meter : bq27421-g1.

 

We observed a strange behavior on these 2 parameters:

  • RemainingCapacity

  • FullChargeCapacity

 

See example below by reading the registers:

72;04; => 1138 NominalAvailableCapacity = 1138 mAh

84;04; => 1156 FullAvailableCapacity = 1138 mAh

ea;07; => 2026 RemainingCapacity = 2026 mAh

09;08; => 2057 FullChargeCapacity = 2057 mAh

 

As you can see, the RemainingCapacity is much higher! These values are by default the filtered one. Are you aware

of any issue/bug of the filtered values? Note, the DesignCapacity is around 1200mAh.

Which corresponds to the nominal capacity of our LiPo battery.

 

On your website, I see no errata note…

Thank for your help.

Kind regards,

Stéphane


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