Accessories Looking For Extended Droid X Battery That Fits Original Phone Case

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I use my Droid X most hours of the day in one way or another... it is my mp3 player as well... my original battery finally needs replacing and I want to find the "biggest"/best/longest lasting battery that will still fit in the original housing, car dock, etc. I have seen this review from about a year ago and the pics he posted with the extended battery installed and I hope there is a better solution available now. I am also going to want a charging station for an additional battery if you know a good one... I saw this one. I guess I will buy on ebay but if you have good buying site please link them! Thanks!