After four years of daily use our MacBook Air informed us that it needed a battery replacement. That’s kind of nice to know, in particular as it still feels speedy and otherwise just works.
A new battery isn’t that expensive and according to iFixit it appeared to be quite easy to replace it. I needn’t to worry, it was actually super simple, given appropriate tools:
Remove 10 screws from bottom case Open case Disconnect battery Remove 5 screws from battery Swap battery Reassemble everything back together Job done.