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Recently I left my PB for a week or so and when I went to use it again obviously the battery had completely run down. So I recharge it and start up and get a message saying that the clock is set to a date earlier than 1969 and some functions may not work. Sure enough I check and the clock has reset to some weird date and time. I reset the clock to the correct time, left it in sleep till the battery ran down and repeated the above and sure enough it happend again.
That's how it works. There's a large capacitor that will maintain the date and time while there is no battery in the machine or when the battery runs down, but eventually it will discharge, resetting the PMU and the date and time.
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