The battery of my macbook pro is always dying when I put it on standby

Whenever I leave my computer on standby the percentage of my battery will go down. For example, it was 95% full and when I came back to it, only 77%. what is wrong here?

How long was it before you returned to your computer?  A few minutes, hours, days?
Battery will drain a little while in sleep mode.  Reason why I always use my magsafe when I step away from my computer because I never know how long I will be.
Go into the system profiler/hardware/power/battery information - post the info here.  DO NOT POST THE SERIAL NUMBER.

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