Accessory Which extended battery? Heavy-duty protective case for extended back cover?

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http://androidforums.com – Two questions: 1. I am looking at four different extended batteries for the Samsung Galaxy S3: Hyperion 4200mAh QCell 4200mAh Anker 4400mAh Onite 4500mAh If you have used or are using one or more of the four extended batteries, which one would you recommend? Specifically, I have the MetroPCS model of Samsung Galaxy S3. I assume all four extended batteries would fit the MetroPCS model. My preference is Anker. I bought a ThinkPad extended battery from Anker in 2010, and had to call the company's customer support to resolve a problem. I had a good experience with the customer support. (General)