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External Battery Case?

The Samsung Galaxy S3 has a myriad of cases available to it. The ones that get my attention are the external back-up battery cases. I use a lot of battery in a day, and having both a more powerful battery in general as well as a backup battery case would be really helpful. Are there any cases that you know of for the Evo V 4G/Evo 3D (I know they are the same, but the product name may not be) similar to something like this?

mophie juice pack Samsung Galaxy S III Rechargeable Backup Battery Case

Thank you!
 

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