A few weeks ago, I purchased an old 11-inch MacBook Air. While it's handy to have a small and light computer to carry around when I travel, I ahem to admit I have a soft spot for good tech that gets superseded or dumped. And while that MacBook passes the "good enough" test for most jobs, I have found the battery life to be less than I need. So, I embarked on the process of replacing the MacBook Air's battery.