To get some info about your battery life, open your terminal and enter:

$ cat /proc/acpi/battery/BAT1/info

this will return you some useful info!
take a look at this output:
  1. present:                 yes
  2. design capacity:         4400 mAh
  3. last full capacity:      4300 mAh
  4. battery technology:      rechargeable
  5. design voltage:          11100 mV
  6. design capacity warning: 0 mAh
  7. design capacity low:     129 mAh
  8. cycle count:          0
  9. capacity granularity 1:  1 mAh
  10. capacity granularity 2:  1 mAh
Well well, at lines 2 and 3 we can notice that there is a gap between the values. If you charged completely your battery and it always doesn’t fit the same value, it may mean that your battery has lost some of its capacity! =/
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Ps: Para ler em portugues, vá no link: http://wp.me/p1n3zu-a