@ndi:
I looked to datasheet of bq27x00 chip again. Percentage which return chip is defined as: nominal available capacity as / last measured discharge value. So you can get 100% when you charge battery to full.

And I see that BME nevert report 100%. So BME must report percentage in other way (e.g. available capacity / design capacity)

So I think this is problem...

@estel:
I contacted countil, but without responce...