G4 Dual 450 Clock Problem

G4 Dual 450, Gigabit Ethernet, OS 10.11, 1.5GB Memory

I replaced the battery on the motherboard because the clock was wrong on boot ups - I got the message that the "wrong clock setting would probably mess up program functioning properly." So, a new battery several weeks ago seemed to solve the problem.

Surprised to see the same error message again yesterday. Any thoughts on why the clock is not staying where I set it? Would a worn out hard drive cause this?
I am replacing the hard drive today, but hope someone has some experience with this issue in the mean time. Thanks

I would try resetiing the PRAM fist to see if that fixes it

http://support.apple.com/kb/HT1379

Thanks. I'll do that, then the other fixes mentioned at that site if it doesn't rectify the situation.