Nohon iPhone 6S Plus/ 6 Plus Battery Case, Portable Charging Case for iPhone 6+ 6S+ (5.5inch) with 2800 mAh Charger Case(Black);

This iPhone 6 plus 6S plus battery case holds large capacity and is the most thinness series. Made of unique slip-resistant silicon. Convenient to plug in iPhone and charge the phone battery at any time, meanwhile well protecting iPhone from damage. Ultimately extend battery life of iPhone for extended hours.

It would be:

Sleek, Compact Design: 0.24inch of thickness ONLY, make battery case more comfortable to hold and slide into your pocket.
Soft Silicon Material: Ultimate bent angle is 90, easy to install and remove.
Extra Battery life: Add up battery life to 14 hours 3G talking, 10 hours web browsing, 8 hours video playback, 4 hours 3D gaming.
Safety Guaranteed: Built-in short circuit, over-charge and temperature protection chip. FCC, ROHS, and CE Certified. Make it safe.
After-sale service: Any defective, pls kindly email us!

Compatible phones: [IPhone 6 plus Battery case (5.5'')], [IPhone 6s plus Battery case (5.5'')]. Fits all versions of the Apple iPhone 6 plus&6s plus(AT&T, T-Mobile, Sprint, Verizon).
Capacity: 2,800mAh Lithium Polymer rechargeable battery
Input: 5V=1A
Output: 5V=1A

In the box:
1 NOHON Rechargeable Battery Case for IPhone 6 plus/ IPhone 6s plus
1 User Manual 

Your might care:
Charging Notes: When charging the battery case with phone attached, the phone battery will be charged first. After the phone battery fully charged, the battery case will be charged automatically. There are LED Indicators for you to check the power level.

Fully charge the battery case before first use.
Use certified lightning cable to charge&sync iPhone 6 plus 6s plus, no need to remove battery case.
If you wanna use the battery of the iPhone itself, please switch it to stand-by model by pressing 3 second to off the battery case power.