Battery level on my MBA 11" jumps up and down

Battery level indicator jumps up and down constantly - between 1 hr and 3:15. I am lucky to get an hour and a quarter of battery life. What happened to the 7 hrs? My MBA is just under a year old. Running Lion. I have done an SMC reset. Any thoughts?

See if the Apple article below helps.
http://support.apple.com/kb/TS1473

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