My MacBook turns off immediately when it is not plugged

Hi all, I've had this macbook for about 2 years now.
It had no problems at all. (I didn't use my macbook for like months)
Then I needed it for my school, so I installed windows 7 using bootcamp a few days ago.
and I've noticed that my macbook turns off immediately when it's unplugged.
i thought it is because of windows at first time,
but I booted on with Mac OS and it has same problem.
It just turns off immediately. and it won't back on until I plug it to charger.
Is it battery problem? or could it be anything else?

Sounds like the battery to me. Usually they don't like being left for months especially if fully charged.
Check the battery health
Click on the Apple icon at the top left corner of the screen
Click on "About this Mac"
Click on "More Info"
Under Hardware, click on "Power". This will show you information about your battery, including how many cycles the battery has been through, it's charging ability and so on.
Thanks
Glenn

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My MacBook turns off immediately when it is not plugged

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