A lot of times this happens when the battery has gone bad and needs to be replaced. It might say 100%, but due to use (and sometimes just due to a faulty battery) the battery will charge less and less and eventually won't hold a charge at all. For example, when I first got my laptop a year and a half ago, I could get almost six hours out of a charge. Now I get almost twenty minutes. Unfortunately, I would say you need a battery. You can get one either from samsung (though you may have to call them, I couldn't find your battery on the site), Newegg.com, or ebay.com.
Some good tips for handling your new battery. First, if the computer's plugged in, remove the battery. Put it back in before you unplug it. This will prevent long-term wear on your battery. Secondly, it's good to regularly (I'd say yearly or so) let your computer "die" on battery (run it until the battery dies), then charge it completely THREE TIMES. This will "cycle" your battery. They say that with the newer batteries used nowadays this isn't an issue, because the new type of battery doesn't create the crystals like the older type does, but it can't hurt anything and I've noticed a difference when I do it.
I'm sorry about the bad news, but hopefully this will help!
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