What's the best MFi certified Iphone 5 battery extender case?

I'm looking for the best durable and best battery extender with an mfi certification.

Added (1). This is kind of strange but what's the point of MFi certification? LIke Maxboost doesn't have it. Does it matter?

Added (2). What is the best battery extender case you have found that incorporates everything like syncing, and reception?

Www.dnkpower.com

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