I seem to be having trouble with my battery in my iBook. I installed iBatt to keep at eye on the interworkings of the battery and in the beginning, the battery had a capacity of 3.2 AH, the battery is 4 years old BTW. Then after charging it read 3.0 AH. Then again after charging it read 2.8 AH. Now it reads 2.66 AH. This is all within a few days. I had a friend take the battery and run some tests on it and it tests at 3.2 AH at full capacity. Could their be a problem with my PMU? This is an iBook Dual USB 500 64MB version.