Hello- I have a Mid 2009 2.53GHz 13" MacBook Pro with the 1000 charge cycle battery. Sometimes, I can only get at most 2 hours out of my battery after it's been calibrated numerous times. My percentage full drops like crazy, until my notebook goes into hibernation mode. If I plug it in, and boot back up, and pull the plug, it just goes back into hibernation mode. HOWEVER- I can turn on my MacBook, and pull the adapter, then put it in target disk mode, and get a full four hours of life from it without the adapter attached. This is AFTER the notebook has hibernated due to "Low Battery" Like I said before, i've tried calibrating it, and pretty much everything else, iStat Pro says my battery has 93% health after 169 Charge Cycles. I've even brought it to the Apple Store and they've said it's perfectly OK after running a battery test via apple hardware test. I mainly use it connected to a cinema display, it has not really been used on battery besides a few charge cycles a month for the past 6 months. When i first got it, I put about 3 full cycles on a day. What could be the problem? Attached is my battery information from system profiler: Battery Information: Model Information: Manufacturer: DP Device name: bq20z451 Pack Lot Code: 0000 PCB Lot Code: 0000 Firmware Version: 0003 Hardware Revision: 0002 Cell Revision: 0100 Charge Information: Charge remaining (mAh): 4527 Fully charged: No Charging: No Full charge capacity (mAh): 5077 Health Information: Cycle count: 170 Condition: Normal Battery Installed: Yes Amperage (mA): -1046 Voltage (mV): 12014 System Power Settings: AC Power: System Sleep Timer (Minutes): 0 Disk Sleep Timer (Minutes): 0 Display Sleep Timer (Minutes): 12 Wake On AC Change: No Wake On Clamshell Open: Yes Wake On LAN: Yes Display Sleep Uses Dim: No Battery Power: System Sleep Timer (Minutes): 10 Disk Sleep Timer (Minutes): 10 Display Sleep Timer (Minutes): 2 Wake On AC Change: No Wake On Clamshell Open: Yes Current Power Source: Yes Display Sleep Uses Dim: Yes Reduce Brightness: Yes Hardware Configuration: UPS Installed: No AC Charger Information: Connected: No Charging: No Power Events: Next Scheduled Events: Type: Wake or Power On Scheduled By: Repeating Event Time: 7/30/10 7:00 AM Type: Shut Down Scheduled By: Repeating Event Time: 7/30/10 1:45 AM Repeating Events: Type: Wake or Power On Time: 6:00 AM every day Type: Shut Down Time: 1:45 AM every day Thank you for your help!