If you believe these pictures, you might be looking at the battery for the rumored iPad Mini that is slated to be revealed in 23rd October. Based on the information from MacRumors, the capacity of the battery is 3 times bigger than iPhone 5.
Based on the description, it is a 3.72v, 16.7Whr battery with a 4490mAh capacity. Judging from weeks of rumors, it seems that the iPad Mini might be true afterall (although Apple has NOT mentioned a single word about it).
Here is another picture.
So, let wait a while. We might be seeing the invitation from popular websites to Apple event soon.
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(source)