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. However, I am open to another brand. 2. I am also looking for a heavy-duty protective case that would fit a Samsung Galaxy S3 fitted with an extended battery back cover. I prefer a multiple-layered protective case, e.g., one that has an exterior hard-plastic shell and an interior soft TPU skin, (like this Trident case, which does not fit a phone with an extended battery back cover; I am looking for one that does.) Would this OtterBox Defender fit a Samsung Galaxy S3 with an extended battery back cover? (This customer review suggests that it would.) If it does not, could you recommend a heavy-duty, multiple-layered protective case that would? Thanks.