Mugen Power Batteries has released the CC-C6903 Mugen Power 3000mAh Extended Battery Case for Sony Xperia Z1. The external battery case aims to double the runtimes of the Xperia Z1's internal battery. Here's more info:
The new battery is fully compatible with the Sony Xperia Z1 and fits well onto the device. All batteries undergo vigorous QA procedures, resulting in the lowest return rate in the market. All Mugen Power batteries are CE and RoHS certified.