Qns:
1. What apps did you turned on?
2. What apps are running in the background?
3. MBP is at least a duo-core and it needs more juice to do just
even powering it up.
4. Your MBP battery is already 1.5 yr old. If you use it daily
and heavily, it'll weaken like everything on earth.
5. You didn't say your MBP is a 15" or 17". The bigger the
greater the power sapping.
6. Did you maintain your battery with complete drain and full
charging?
As a consolation, my G4 Power Book is 7 year old and the sole
original battery can still last 1hr.
Complete drain and full charging is a myth. It has even been
proven by myth busters, full charging and complete drain only works
in ni-mh cells. MBP uses a Li-ion cell so it is not affected.
Although you can try to follow the below instructions, it is no
guarantees to work because this was the instruction to follow for
first time usage of the macbooks.
You are recommended to fully charge the battery so that the
battery is able to "reset" it's max capacity before draining it
until the warning pops up, save everything and wait for it to go
into sleep mode. Leave it for another 5 hours or so to completely
drain the battery before connecting the magsafe adapter to fully
charge it, you may use it while it's charging.
