if you dont need the machine to remember date and time you dont need it more convence thing these days when ran a bbs it was important other wise ever time started the machine or restarted it l have to change the time to corect time and date .
which you can do i prefs
the amiga 1200 if it standred machine with nothing in trapdoor expansion bay underneth
doesint have battery for the clock on mainboard
but any expansion ram card or cpu card expansion has them also they do need replacing though havent had to on my owns yet
there just a round flat battery simalar to watch battery only bigger
