Why has my iBook started to completely shuts down when power runs out?

I purchased my iBook G4 in early 2006 (OSX 10.4.11)
Until last week, I would regularly use my laptop until the battery charge was used up. I would get a low charge warning and it would automatically sleep. I could then plug it in to charge. When it was plugged in, I could touch the track pad or power button and all of the programs that were open when the power ran out would be there, just as I left them.
This has recently changed. Now when the power runs out, I receive the same low charge message, but instead of sleeping, my computer completely shuts down. When I press the power button to reboot, everything starts back up fine, but I get a message that my date and time are off and need to be reset. I then go to the Date and Time menu, which automatically updates through my wireless connection.
My questions are:
1. Why is it shutting down instead of sleeping?
2. Why is my date and time reseting to an incorrect date and time?

The difference is that in the past, your battery shut the computer down when their was enough juice to safely sleep the machine. Now it thinks it has enough juice, but it's truly running out. The battery is necessary to maintain the date and time in the computer.
Your battery needs to be calibrated. You should follow the instructions at:
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh1959.html
This will allow the battery to truly know how much juice it has left.

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