Replacing the internal battery on a G3 iMac
Originally posted on my iBlog 26 September 2004.
Summary: Our iMac started forgetting the time of day and all sorts of other important settings. This was because its internal battery was flat (modern Macs don't have this system so don't get so forgetful).
The battery in question is a 3.6v half AA Lithiumionyl Chloride Cell. They are available from specialist battery stores (we got ours in Christchurch for about NZ$15).
There are excellent instructions on how to change this battery at http://www.third-perspective.co.uk/archives/000032.html. If that link doesn't work, I also have a PDF of the webpage achived here.
It's quick and easy!