My problem is that even if the battery percentage is 0 the notebook can stay on around an hour. I have disabled "critical battery action" on my operating systems to use more time my notebook. The designed capacity is 66 Wh, the battery currently reports 9 Wh when battery is full.
I tried to fully charge the battery (around 5 hours) and then let the battery drain completely. That increased the full energy value from 3 Wh to 9 Wh.
Is there any way to trully fix the full capacity value of the battery?
I think that the battery's problem occured from my previous faulty power supply.
My notebooks is Dell Inspiron 3521. Operating Systems: Ubuntu 14.04 based & Windows 8.1
Vendor : Simplo Model : DELL 4DMNG31N Energy : 9,2 Wh Energy When Full : 9,2 Wh Energy (design): 66,6 Wh Voltage : 12,2 V
More Info Requested:
The battery is 1.5 years old, the previous battery after a year was dead ("Battery has experienced permanent failure" message at boot) and Dell send me a new one. The power supply some times couldn't charge the notebook and sometimes gave less watt than 90 that my notebook needed (problem with the cable, just received a new one from Dell too) Bios doesn't have any utility for the battery.