I was wondering if anyone with experience from an old Macbook Air could give me some insight about how long (in years) the battery lasts. How long was it before they couldn't hold a charge for more than a minute, are they still going strong? I have a Powerbook and I remember by the 4th year it started dying after 10 minutes. Now, it won't last more than 20 seconds. Yet, my System Profiler says: Health Information: Cycle count: 651 Condition: Good FYI I have also never bought a replacement. Anyways if someone could impress upon me how the Macbook Air battery compares, I'd appreciate that a lot. Thanks!