I recently upgraded to a new G4 15" 1.25 Ghz PowerBook and have encountered the following battery problem that I'm seeking a solution to (no, I've not yet had a chance to contact Apple directly).
1) I first read the manual prior to interacting with the machine (though restraint was trying) and discovered on page 20 that you are to first calibrate the battery. I did so following the instructions (AC to 100%, drain until machine goes to sleep, AC back to 100%). This appeared to work at first, as the machine properly indicated a full 100% charge upon reconnecting to AC and letting it charge to full capacity. I then upgraded to 10.2.8 after reading Apple's information about battery issues.
2) However, approximately 2 to 2.5 days later, while the machine was on continuous AC, always shutting down after usage, the battery charge indicator indicated a loss of percentage of 1 to 2 percent. I have been loosing roughly one percent of battery capacity every 2 days.
3) I discovered a command-line tool on the web that allowed me to gain a more accurate profile of the battery (
http://www.mitt-eget.com/) that has yielded the following information (my own personal log):
Last login: Thu Oct 16 09:59:08 on console
Battery 1
Battery: battery installed, above warning level
Charger: charger connected, not charging
UPS: UPS not installed
Voltage: 12.316V
Current: 1.200A (approx 3:09)
Capacity: 3.788Ah of 3.944Ah (96.0%)
Last login: Sat Oct 18 10:19:19 on console
Battery 1
Battery: battery installed, above warning level
Charger: charger connected, not charging
UPS: UPS not installed
Voltage: 12.276V
Current: 1.200A (approx 3:07)
Capacity: 3.756Ah of 3.944Ah (95.2%)
Last login: Sun Oct 19 07:48:36 on console
Battery 1
Battery: battery installed, above warning level
Charger: charger connected, not charging
UPS: UPS not installed
Voltage: 12.264V
Current: 1.200A (approx 3:07)
Capacity: 3.748Ah of 3.944Ah (95.0%)
Last login: Sun Oct 19 16:30:19 on console
Battery 1
Battery: battery installed, above warning level
Charger: charger connected, not charging
UPS: UPS not installed
Voltage: 12.259V
Current: 1.200A (approx 3:07)
Capacity: 3.744Ah of 3.944Ah (94.9%)
You will notice that the battery continues to drain, even though on AC (machine has not been off AC expect when moved back and forth to work and home).
There has been some suggestions on various web pages that calibration of the battery may need to be done more than once, this I've not tried yet, but may consider it soon (perhaps after speaking with Apple).
Any further insight is appreciated.