OK Laptop except for Battery Life

I got it for $699 CDN (including extended warranty) from Staples. For a basic laptop, you can't beat it. Enough speed for everyday use, however, specs state battery life is 2.5 to 3 hrs. Not even close. I've had it for approx 4 months now and no improvement in life. After a full charge, it lasts only about 2 to 2.5 hrs.