Why does my Powerbook system date reset?

Every so often the system date and time on my Powerbook G4 resets? I then get a warning from the OS stating that it has lost time? I thought OSX (Leopard) updated it's time and date upon boot?? Any ideas?

The TiBook backup battery is a bit of a problem, as it is a Li-ion unit no longer manufactured by Panasonic.  It resides in a small printed wiring board assembly under the optical drive and is soldered to same.  The youngest one would be on the order of eight years ago, which is pretty long in the tooth.
You can get a replacement new and compatible battery from iFixit, at least, which requires some soldering skill and equipment.  (I will be installing one in a few days, as Ijust ordered one of the batteries from them.)
The TiBook battery is a little heartier than just a clock battery, as it needs to be able to hold up the computer in sleep mode for at least a couple of minutes while a battery is being changed.

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