iPhone 6S Plus Battery Case, Rhidon 4000 mAh Power Bank Case Rechargeable Protective Battery Charging Case for Apple iPhone 6 Plus (5.5 inch)(Rose Gold) LARGE CAPACITY: The powerful 4000mAh Li-polymer rechargeable battery can effectively provide 100%+ extra battery life to your iPhone 6/6S Plus, which is equivalent to add 14+ hours talk time or 12+ hours web browsing time. SMART CHARGE: Integrated circuit design ,effectively avoid shorting circuit or overcharge even under extreme condition of wrong operating . FAST CHARGE: Charge and discharge at same time .Press the button to charge for phone first, and after full charge, it will be smarted changed to charge for backup battery. it will be automatic power down after power saturation . PRACTICAL DESIGN: Its shell used Piano paint process or scrub treatment,high-end and very nice hand feeling. The holder function is a very special sweet design, it allows us watch film and charge at same time ! PERFECTLY COMPATIBLE: Works with iOS8/iOS9 and all future updates ;When charging the power case ,put your phone into the case , press the switch key to sync data with iTunes .