Accessory Third Party Battery

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http://androidforums.com – Most of us are having problem with the battery's short hour. One solution is to use a bigger capacity battery which is a third party battery. Is it safe to use a third party battery? I have looked around and there is some 2000 mAh batteries for w. I think it is made in china or japan. Is it a good idea to use these batteries? Or should I stick with the original from Samsung? (General)