Hi- I want to buy an extra battery and car charger for my razr since the battery life sucks. Looking on ebay and there are some for cheap. Is there a major difference between oem and non-oem? What exactly does non-oem mean? This is just to have an extra battery in my purse in case I can't get my phone charged. Any suggestions? (other than get rid of razr LOL. it sucks i know)

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