Random Loss of Power

I have just got a 15" powerbook - It did have a dud battery, I now have a nice new one that charges OK and I have calabrated it...
But every now and again when on battery power the machine just looses power, e.g. if you had no battery and pulled the charger out of the side.
Is this just a case of the battery need re-calabrating?
Cheers
Carl

Since the same thing happened with my new PB (15" hi-res, 1.67 GHz - battery would not charge), I am wondering whether you have the same problem with the new replacement battery...
1. the battery status lights remain on (4 of 5) whenever the battery is plugged into the AC adaptor.
2. after resetting PMU and running the Powerbook Update (to fix battery problems in the new PBs by resetting the battery firmware), the lights are off... but, the battery capacity fluctuates (loses capacity and then gains capacity) while on battery power only.
Has either of these been your experience?
Have you reset the PMU after receiving the new battery?
Have you run the PB Update?

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