I have had my Macbook Air since late March, and it has been a great notebook and primary computer. Since then, I put the battery through 41 charge cycles.
I happened to open System Profiler two days ago, and under Power > Condition, it said “Check Battery.” A little odd.
A quick open of Coconut Battery showed that my Macbook Air’s battery was down to 76% of its original charge capacity. I called AppleCare support yesterday, and they were very helpful. The customer representative checked with product specialists to see if there was any troubleshooting they could do, and curiously asked me what brand of wireless router I use. That avenue a dead-end, he then told me the only way to fix it was to replace the battery, as expected, and he set up an appointment at my local Apple store for me.
I went there today, and the Genius who helped me immediately decided to replace the battery under warranty. After an hour or so of reading Daring Fireball and Shawn Blanc’s archive, it was finished.
No questions, no conditions — just great service.
I love when companies do the right thing, and Apple has a history of it.