Battery keeps "Calculating...."

This is my first post here so apologies if I'm on old ground.
For the first time today the battery of my Powerbook displayed odd signs.
When I plug into the mains I have the setting to show how much time is left in the battery. When I plugged in today it seemed to get stuck on " calculating". The time did not appear.
In system preferences the battery charge seemed to be stuck at 95%.
Has anyone any experience of this problem?
Thanks for the Help
Marky

I have the same problem with my Powerbook G4. It's three years old, with a relatively new battery. While it's true the primary downside to this is that there is no warning before shutdown, this is not an acceptable situation. Sudden shutdowns can't be healthy for data and I'm hitting 'save' so often it feels like Windows.
My problem began when I upgraded to 10.4.5. It was fine before this. Now, my computer shuts down suddenly, and when restarted it says the battery is at 40-50% and that it's May, 1970. I can't tell you how embarrasing it is, walking around with a laptop that wears flares and a rainbow tube-top.
Here's my battery stats:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 2426
Remaining Capacity (mAh): 2426
Amperage (mA): 0
Voltage (mV): 12456
Cycle Count: 158
I have not found a fix for this on any powerbook thread. I guess the lesson here is that, once you find an OS that works without a hitch, stay with it. A few more bells and whistles are not worth the risk. Especially if your warranty is up.

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