Internal battery for ibook

Newbie with a 366 mhz graphite clamshell. Internal battery appears to be dead (clock not keeping time etc) and is now causing problems with programs.
Is this a major repair?
Any suggestions GREATLY appreciated!

WOW! thanks for the ultra fast reply!
I was the impression that there was a different power source for the clock etc. than the main battery. Is this incorrect?
I was told that the ibook has a separate small battery that, depending on the age of the machine, might be welded to the motherboard.

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