Battery Time Estimation jumps around.

Sorry if this question has already been answered but is there a way to fix this problem?
I got this new MacBook for Christmas and I keep the Battery Time Estimation on my Finder bar. It often jumps around for example: It jumps from 7 hours to 5 to 4 to 6 and so on. It seems to always stay within 3 hours of what seems to be accurate. Thanks!

Absolutely!
I decided to put the "test" to practice this morning and unplugged my laptop from AC power. Immediately it read that I had 4hrs, 32mins of charge remaining, which translated to 100% of battery life. I turned off WiFi, set the backlight to 50% and just let it sit with nothing running and 15 minutes later it said I now had 6hrs and 14mins of charge remaining, which now translated to 99% of battery life.
I turned on WiFi, launched Mail and iChat, then proceeded to launch Safari and began opening various threads in the discussions to read/review. My battery percentage dipped to 98% and the life dropped to 5hrs and 02mins.
After another 10-15 minutes of reading the forums and looking at some other websites I decided to launch iTunes and download a podcast that publishes on Thursdays. After it completed downloading, my battery life now read 95% and I had 4hrs and 32mins to go.
I stepped away, came back about 10 minutes later to find I had 94% battery life remaining but had 7hrs and 18mins of life remaining as the computer had been idle the entire time.
So you can see how the time jumped from 4 -> 6 -> 5 -> 4 -> 7 in a span of less than one hour of various usage states. However, throughout the entire time the percentage indicator continued to slowly decrease from 100% to 93% where it now sits as I post this.

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