x220 battery info

This situation piss me off a big time. And I don’t understand what’s wrong ! I’ve a 9 cell battery, but I’m not able to squeeze out of it more then 1.30 mins. And this is ridiculous considering that other people report 6 hs and more with an x220 and a 9 cell bat.

Well I’m putting here various info for reference… maybe I’ll find the culprit .

These info are obtained with this script: thinkpad-smapi.sh

    BATTERY 0 INFORMATION
    =====================

    Battery slot:
      Battery present: yes
      Battery state: discharging

    Embedded info:
      FRU P/N: 42T4940
      Barcoding: 1ZJRM1BHCDR
      Serial number: 13521
      OEM Manufacturer: SANYO
      Chemistry: LION
      Manufacture date: 2011-11-17
      Design capacity & voltage: 93240 mWh, 11100 mV

    Battery health:
      First use date: 2012-01-23
      Cycle count: 134
      Last full capacity: 93180 mWh
      Average current / power (past 1 minute): -1079 mA, -12077 mW

    Battery status:
      Remaining capacity: 78420 mWh (84 %)
      Remaining running time: 441 min
      Running current & power: -1054 mA, -11797 mW
      Temperature: 33400 mC
      Voltage: 11193 mV
      Remaining charging time: [not charging]

    Battery charging control:
      Start charging at: [unavailable] %
      Stop charging at: 85 %
      Prevent charging for: 0 min
      Force battery discharge: [unavailable]

Here I print out the output of ibam

$ibam --all
Bios percentage:            81 %
Battery percentage:         80 %
Soft low percentage limit:  4 %
Charge percentage:          81 %
Bios time left:              1:00:00
Battery time left:           6:33:59
Adapted battery time left:   6:33:59
Charge time left:            0:22:48
Adapted charge time left:    0:22:48
Total battery time:          8:11:12
Adapted total battery time:  8:11:12
Total charge time:           2:00:00
Adapted total charge time:   2:00:00
Profile logging enabled.
Current file: /home/abate/.ibam/profile-002-battery

$acpitool -B
  Battery #1     : present
    Remaining capacity : 75460 mWh, 80.98%, 06:09:21
    Design capacity    : 93240 mWh
    Last full capacity : 93180 mWh, 99.94% of design capacity
    Capacity loss      : 0.06435%
    Present rate       : 12258 mW
    Charging state     : Discharging
    Battery type       : Li-ion 
    Model number       : 42T4940
    Serial number      : 13521

And this is what upsets me the most. One moment the battery is at 74% one moment at 6% !!! I really don’t understand …

$ibam --all
Bios percentage:            70 %
Battery percentage:         72 %
Soft low percentage limit:  4 %
Charge percentage:          70 %
Bios time left:              5:37:45
Battery time left:           8:41:28
Adapted battery time left:  39:16:35
Charge time left:            0:36:00
Adapted charge time left:    0:07:58
Total battery time:         12:00:57
Adapted total battery time: 54:18:04
Total charge time:           2:00:00
Adapted total charge time:   0:26:33
Profile logging enabled.
Current file: /home/abate/.ibam/profile-003-battery

$ibam --all
Bios percentage:            6 %
Battery percentage:         2 %
Soft low percentage limit:  4 %
Charge percentage:          6 %
Bios time left:              0:33:45
Battery time left:           0:15:50
Adapted battery time left:   1:11:33
Charge time left:            1:52:48
Adapted charge time left:    0:24:58
Total battery time:         12:00:57
Adapted total battery time: 54:18:05
Total charge time:           2:00:00
Adapted total charge time:   0:26:33
Profile logging enabled.
Current file: /home/abate/.ibam/profile-003-battery

$ibam --all
Bios percentage:            6 %
Battery percentage:         2 %
Soft low percentage limit:  4 %
Charge percentage:          6 %
Bios time left:              0:28:46
Battery time left:           0:15:50
Adapted battery time left:   1:11:33
Charge time left:            1:52:48
Adapted charge time left:    0:24:58
Total battery time:         12:00:57
Adapted total battery time: 54:18:05
Total charge time:           2:00:00
Adapted total charge time:   0:26:33
Profile logging enabled.
Current file: /home/abate/.ibam/profile-003-battery

Update

Interesting post : http://zbz.ca/X220/thinkpad_x220_linux.html

Update 2

I finally managed to get a new battery and BAM ! 8 hrs on a charge. I feel really unlucky with this new laptop …