@Schoenfeld
Thanks for your answers - it's good to know more devices can now be used with the A600. I have not heard of the melody before - what is it?
It is also good that the RTC is not an all in one battery+clock type (like the Dallas ones) - which are inconvenient to replace.
7-8 years was about my expectation - but considering the life of the Amiga so far, it's not unreasonable to expect it will require replacement in the future.
Hopefully that type of battery is still around then (or obtainable in Australia). For this reason, I probably would have preferred a CR2032 coin cell battery.