Worse Battery Charge for Mac Pro

I bought my MacBook Pro in August 2009. At first it had a fully charged battery life of 5 hours. Now the maximum battery life being off the power cord it about 2 hours
The Full charge capacity (mAh) is 3754 and is on cycle 469.
How can this be fixed? and is there a way I can get a new one under warranty?
Thanks
Em

It can't be fixed, and it probably won't be replaced under warranty (though there's no harm in asking). Your battery has been used very hard — i.e. cycled almost every day — for more than a year and a half, and it's starting to get tired. When it no longer gives you enough running time on a charge to be practical for you to use, buy a new one.

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