DX-4 Protective Battery Case

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DX-4 Protective Battery Case

Our Amazon's best-selling battery case for iPhone 4/4s, the DX battery case boasts a thickness of just 17mm, while also effectively doubling battery life. This technically advanced case also halves the time needed to re-charge the battery.  It even allows users to sync-and-charge while the case is still attached to the iPhone. Also, made for complete protection, the DX exhibits an ergonomic hand-held fit, an anti-slip coating, and a comprehensive casing to ensure peace-of-mind.

Size is Everything

Highlighted by its lightweight, ultra slim design, the DX case measures an impressive depth of just 17mm. The sleek protective case is made to fit snuggly and enhance the iPhone 4/4s natural look while still producing astonishing power and functional design.

Extended Battery Life

Equipped with a 1700mAh battery cell the DX almost doubles the life of an iPhone 4/4s. The additional power yields six hours of talk-time, 30 hours of music playback, and a hefty 240 hours of standby time.

Technically Advanced

Made with state-of-the-art technology, the DX exhibits a battery which almost doubles the lifetime of the iPhone, allows users to sync and charge with the case equipped, and view current battery levels via the LED battery level indicator.

Form and Function

We designed the DX to not only be stylish but effective. It enhances the natural acoustics of the phone while providing an unobtrusive shield of complete protection. The ultra-slim case makes it ideal for on-the-go users, and an invisible charging switch allows the user to decide then an extra power boost is needed.

Tech Specifications

Material Lithium Polymer

Capacity 1700mAh

Dimension 120x62x17 (mm)

Charging Time 3-4 hours

Life Cycles 500 Cycles

Item Content

1 x Micro USB charging Cord

1 x Elegant uNu retail package +
Hard Shell Carrying Box

1 x Micro Fiber screen cleaning cloth

1 x Glossy white battery case for iPhone 4

1 x Transparent Screen protector for iPhone 4

Made for iPhone

Awarded the prestigious “Made for iPhone” certification, the DX has gone through extensive testing and quality assurance to ensure reliability. In fact the DX has been proven to give quality power even after 500 full recharging cycles!


1. Does this case work for the iPhone 4s as well as the iPhone 4?
A: Yes, this case works with both the iPhone 4s as well as the iPhone 4.
2. Can I replace the top piece of the case if it is lost or broken?
A: Yes, additional parts can be purchased on our website in the add-on section.
3. How much battery life can this case provide?
A: The DX has a battery capacity of 1700mAh which approximately yields another 100% power to battery power.
4. How do I turn the case ON and OFF?
A: The DX uses an ON/OFF button which is located on the back of the case next to the LED battery life indicator display. Simply PRESS and Hold the button for 3 seconds to turn the case ON or OFF.
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