Premature shut down on battery power . . .

So I have seen this issue posted in other topics but nowhere have I seen an answer so I thought I would start a new thread. Actually I have two issues.
To start, I am using a 14" ibook G4 (the most recent version with the 1.42 GHz chip), 1.5gb RAM, 60GB HD. The ibook was purchased new in early September. It is still under warranty, but not phone support.
Issue 1. When I use my ibook on battery power often (but not always) it shuts down when I have about 20% power left in the battery. There is enough power to restart and work for several more minutes (sometime as much as half an hour). When it shuts down like this there is no low battery warning it just shuts off. And in fact it freezes. That is to say the screen is dark, the little white light that snores when the ibook is asleep in not on. However the only way I can restart is to hit control-apple-power, rather then just the power button alone. Usually when I restart my ibook it then runs fine till I get the low battery warning.
I have tried resetting the PRAM and I have re-calibrated my battery, neither of these things seems to have helped. I have lost some work with this so I really want to figure it out. Any ideas on how to make this stop?
Issue 2. As stated previously this is a relatively new ibook (4 months old). My battery only gives about 4 hours of work time max. I installed CoconutBattery in December and I had only 89% capacity (after 64 charge-cycles). This capacity has not changed since I first installed CB (now at 71 cycles). How low a capacity does a battery have to have to be eligible for replacement under the apple warranty. It seems a new battery should have over 90% capacity.
I really was hoping to be able to get closer to 5 hours of work time out of the battery. One of the reasons that I went with the ibook instead of the powerbook was for the longer battery life.
ibook g4   Mac OS X (10.4.3)   PowerMac Mirror Door dual 1ghz

1. Resetting the PMU should take care of it.
2. Here are a few tips to maximize battery life.
A. Lower the brightness to about 5 or 6 bars.
B. Turn Airport off if you don't need it.
C. If there's a disc in the optical drive, remove it.
D. Set the processor performance to Reduced or Automatic in Energy Saver preferences.
89% and 4 hours run time after 71 cycles seems to be pretty good to me. All manufacturers take the steps I noted above to test battery longevity. If you expect to get the same results you have to setup the computer the same.
John

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