On the older airs, it's very simple. I finally got around to replacing the battery on a 2011 air that I still use every day. Cost about $65 and took about ten

On the older airs, it's very simple. I finally got around to replacing the battery on a 2011 air that I still use every day. Cost about $65 and took about ten minutes. The kit even came with the odd little screwdriver bits I needed.