Power Mac Desktop G3 Blue & White - Bad Battery?

Hello all - I just found you G3 guys here
I have this older G3 Blue & White 350 mhz loaded with OS 9.1, and I haven't powered it up for a number of years. When I went to power it up, the network clock was naturally out of wack. Got an error which said:
Network Time in error set for 1956. I reset the time and date several times, and although it works briefly, it won't keep accurate time. Is this indicative of a battery replacement? The battery is small and cylindrical - shaped like a camera battery - Not Flat.
Yes? And if so, is it any big deal to replace? Do I need to reset anything?
And another problem is that the power button periodically gets stuck. Sometimes it retracts, and sometimes it doesn't. Sometimes the machine is starting to boot, when it just cuts off. If I wait a while, it can eventually start and boot up completely but usually gives the bad time error message again. Is this a separate issue? Or could it be related to a bad battery, and bad time and date?
Thank you
Mike

ENIGMACODE,
Yes, the minature - 1/2 AA height - battery is the one to replace. Radio Shack sells them for $15 or you can shop on line and find some for half that.
If you have a power strip and all components are plugged in, when you turn off the power strip, you turn off the only source of power to keep you clock going. You can shut down the computer but not turn off the power strip and the clock will continue to work fine. My B&W has gone more than a year on a dead battery.
If you startup, set the clock, then hit restart, the correct time should be retained in memory because the power is not interupted. If it loses the time during that reset or restart, you have other issues.
The sticking power button is most likely misaligned plastic. Double check to make sure that it is not sticking. Then use the keyboard to turn on and off the computer. That will isolate the switch to see if the problems are related or not.
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