MBP shuts down suddenly on battery

I have a 17" MBP 2.4 GHz Intel Core 2 Duo. In the last week or two, I have had the laptop shut down, bang, no warning, gone, while on battery. The battery is around 40% charged when this happens.
Under Power in About this Mac I have
Model Information:
Manufacturer: SMP
Device name: ASMB014
Pack Lot Code: 0002
PCB Lot Code: 0000
Firmware Version: 102a
Hardware Revision: 0500
Cell Revision: 0102
Charge Information:
Charge remaining (mAh): 2522
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 6098
Health Information:
Cycle count: 162
Condition: Normal
Battery Installed: Yes
Amperage (mA): 277
Voltage (mV): 10526
I'm thinking I have a battery problem, despite Condition Normal.
Does anyone have any similar experience or any ideas? Thanks. I'm plugged in and running fine now.

I have the same problem around 35%. MBP 2.33 ghz Intel Core 2 duo
Model Information:
Manufacturer: SMP
Device name: ASMB012
Pack Lot Code: 0002
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0500
Cell Revision: 0200
Charge Information:
Charge remaining (mAh): 1615
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 4433
Health Information:
Cycle count: 234
Condition: Normal
Battery Installed: Yes
Amperage (mA): 1843
Voltage (mV): 11847
what's the solution?!?

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    Owner & Operator of the following:
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