BQ27220: How can I read battery percentage from BQ27220 when connected with 9000mAH.

Hey Abhineet,

Have you run the GPCCEDV tool yet? You can read battery percentage by reading the State of Charge register (0x2C).

Regards,
Nick Richards

We are not using EVM. It is in aur PCB. 
I can read battery percentage using 0x2C but unable to set Full charge capacity, it is showing 3000mAH. how can I set FCC. 

Regards

Abhineet Ranjan

Hey Abhineet,

FCC is not a value that is set by the user, this is a value that is calculated and reported by the gauge when in use. Running the GPCCEDV tool helps improve gauging accuracy. Have you made sure to change the Design Capacity parameter? Also, try running one cycle of a discharge relax charge test to see if FCC updates.

Regards,
Nick Richards

Hello Nick,
1) Does it effect the Fast charging of the battery.

2) I am trying to read battery percentage and it is not even close to true value.

3) I tried running one cycle of a discharge relax charge test to see if FCC, but it is still gives 3000mAh.

Regards

I am trying to read battery percentage and it is not even close to true value.

Hey Abhineet,

Abhineet Ranjan said:

1) Does it effect the Fast charging of the battery.

What are you referring to?

Are you able to send me a gg file from your gauge so I can check the parameters?

Regards,

Nick Richards

Hello Nick,
I Don't have gg file, may be because I'm not using BQ studio. 

and for fast charging, earlier I was BQ25792 without fuel gauge, battery was accepting 1.65A but after fuel gauge it takes current between 0.6A to 0.8A.

Regards,

Hey Abhineet,

Is there any way to send a data dump so I can see what value all the parameters on the gauge are set to.
No, it should not affect fast charging.

Regards,
Nick Richards