Sudden decline in battery duration?

Purchased macbook pro in October 2007, so i've had it for about six months. Battery regularly held up for about 4-5 hours during school usage (typing, surfing, researching), and nothing heavy. However, just within the past two days i noticed significant drop-off in my battery duration. My battery currently only lasts for about an hour to two hours doing the same things (as indicated by timer on the top right of the screen). Just wanted to know if this regularly occurs for anybody else as well, because it seems quite abnormal to me to lose almost 50% of your battery duration in one day. Other symptoms include: fans spin much faster and louder, cpu heats up quite high. Again, just to emphasize that this is just for light usage.
I saw that others with related problems included information about their batteries, so here it is:
Model Information:
Serial Number: Sony-ASMB012-3711-eab6
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0003
PCB Lot Code: 0000
Firmware Version: 102a
Hardware Revision: 0500
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 5250
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 5287
Health Information:
Cycle count: 66
Battery health: Good
Battery Installed: Yes
Amperage (mA): -2935
Voltage (mV): 12084

stedman1 wrote:
Hi dereklok: You are on the right track, but at the bottom of the Activity Monitor screen, click on the CPU tab instead of the System Memory tab. When that one is open, click on the CPU tab at the top to sort by that column. Also at the top of the Activity Monitor dialog box make sure that All Processes is shown. This will show you the processes and the amount of CPU activity.
Sorry if I stepped on your answer Kane
Stedman
No problem, you're filling in the op on what I left out. : )

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Attachments:
11-7 Current.jpg ‏64 KB
11-7 Power.jpg ‏62 KB

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Sudden decline in battery duration?

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