In my opinion this working time that you can see is not 100% right and it is “approximate” working time.
When I start my Tecra A11 with full battery it is shown that I can use notebook up to 4 hours but after 3 hours is the end.

I think there is no reason for panic.
Make full battery load and work on it just to see what maximum working time on battery power supply is. Define all settings and set low battery notification and critical battery action in advanced power settings.

Ufff, this time was much better, but I'm still not quite satisfied...

After second full charging it took me 3 days to discharge it First of all I changed low battery level and critical level: accordingly from 10 to 7% and from 5 to 3%.

Let's see tha last fragment of discharging history:
2,34h - 33% (wi-fi on)
2,31h - 28% (wi-fi on)
2,02h - 25% (wi-fi off, bluetooth on)
1,31h - 21% (wi-fi off, bluetooth on)
1,02h - 19% (wi-fi off, bluetooth on)
1,44h - 17% (wi-fi off, bluetooth off)
1,34h - 14% everything off
40min - 13%
37min - 5%
hibernation...

These changes (1,34h - 14%, 40min - 13%, 37min - 5%) were rather rapid, so you have to be careful below 15%.
Unfortunately I can't say what was the whole working time cause I've been using it 4 or 5 times for about 1-2h - approximately 6-8 hours.
Fortunately, self-discharging anytime was only 1-2%
Full charging proccess takes 3,30h.

Great! Thanks for the feedback. I can confirm this… the battery needs to be calibrated. This means the battery should be discharged completly and charged several times to get the best performance