iPhone 6S 6 (4.7") Battery Case [Extra Bonus-Tempered Glass Screen Protector], 3800mAh External Battery Backup Protective Charger Case for iPhone 6 / 6S (Blue) This ergonomic, form-fitting, impact-resistant 2in1 battery case keeps your iPhone charged and protected on the go, and the precise cuts and accurate design allows easy access to all ports and buttons Extra battery life: add up to 7 hours 3G internet, 11 hours WIFI, 8 hours 3G talktime, 16 hours 2G talktime, 11 hours video, 44 hours audio Rechargeable for over 500 FULL cycles, partial cycles don't count as full To charge & sync your iPhone 6 / 6s with lightning cable, no need to remove battery case. With extra bonus - Tempered Glass Screen Protector Battery Indicator: The 4 LED lights at the back of the case tell you exactly how much juice it's got left when you press the "power" button. It also indicates the charging status.If the battery case can't charge "Firstly, please be sure the battery case was fully charged before using it to charge the phone. Secondly, when charge the phone, please press the battery switch button 2-3 seconds (long-press)