with built-in battery
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2,300 mAh battery more than doubles your battery capacity. Press the charging button to start your charge or check the battery level.
The ENERGI Sliding Power Case for the Galaxy S 4 with a slide on battery sleeve is made for the real world. And with slim battery technology we only add 9mm to the thickness of the device, you barely know you are carrying 9 additional hours of talk time. We include 2 slim-line cases; 1 black, 1 colored, so you can change your style on-the-fly.
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5/5 stars - Among powered cases, the TYLT Energi sliding case is the most innovative and flexible I have tested to date.
If you're looking for a battery charging case that won't add too much bulk to your iPhone or Galaxy S4, the TYLT Energi Sliding Power Case is a great choice.
Given the case's minimalistic aesthetic and simple lines, it manages to pull off looking pretty chic.