Shuts down on 40% battery without warning

I love my macbook, but recently, it is acting strangely. When I am working with the AC plugged in, when the battery power reaches 40%, it just shuts down without any warning. I have been up to date with the software update always and have battery update 1.3 and 1.4. I have calibrated the battery regularly. Please help, as this unpredictability is killing me.
Another issue, the crack on the right hand side: this is the second time, I have changed it and again, the crack and complete dislodgment has happened. I am not one of those who handle without care. I even have a hard cover for my macbook.

I'm having the same issue started this week, I was using 10.5.8 now on 10.6 I have a 17 macbook pro, 2.4 ghz,below is my battery information, any ideas? Has anyone solved this issue?
Battery Information:
Model Information:
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 3090
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 3179
Health Information:
Cycle count: 209
Condition: Check Battery
Battery Installed: Yes
Amperage (mA): 196
Voltage (mV): 12597
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 180
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 60
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: No
Current Power Source: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 0
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
ID: 0x0100
Wattage (W): 85
Revision: 0x0000
Family: 0x00ba
Serial Number: 0x00529753
Charging: Yes

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