Freeze after a long time

I have a peculiar problem with my iMac. When I turn on my iMac it will freeze at the blue screen or shortly after my desktop loads. However I've noticed that it will only do this when the computer is off for a long time. Usually when I turn it on in the morning. When I hold the power button for shutdown and then turn it back on it loads fine. I have noticed sometimes that the time is completely wrong as well.
So after doing some investigations I saw that I should reset the nvram and that it might be a battery problem. This actually makes sense to me because if it's been off for awhile then the a bad battery would be empty but it charges a bit when I turn it on. Then when I restart I have a working battery.
I also recently put bootcamp and windows xp on my computer.
I did a disk utility as well and did a scan and fixed any permissions and it still does this. So is the battery my problem or is it something more subtle?

From your description yes I would change the battery out as the time showing up wrong and the difficulty in starting up are examples of a bad battery. Thats not to say that some other issue may be behind the problem, but the battery is a good start.

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