RAVPower® Samsung Galaxy S4 Charger / S IV i9500 Desktop Charging Cradle & Sync Dock (Spare S4 Battery Charger, Detachable Case Plate, Compatible without or with a Slim-Fit Case,Black)
RAVPower-Reliable  Affordable  ValueThis dual dock cradle desktop charger lets the phone charge while synchronized with your PC to transfer files and media. A 2nd battery slot is located on the rear of the cradle so you can charge a spare or replacement battery while charging the phone.3-In-1 Features:Charge phone, synchronize files and media, and charge a 2nd Battery all at the same time.Dock your phone with or without case cover with the detachable case plate on/off.Phone Charging Slot:Light will turn blue when corresponding to the AC power supply.Red light indicates that battery is charging.Green light indicates battery is fully charged.Battery Charging Slot:Red light indicates that battery is charging.Green light indicates battery is fully charged.Flash Red light indicates battery is not connected well.Compatible Models:- Global Version Samsung Galaxy S4 i9500, AT&T;, T-Mobile, Sprint, Verizon, Cricket, US CellularNote:- Does not work with the extended battery.- Protective case is not over 2mm thick with detachable case plate off.- If you unplug the battery from the battery charging slot when the battery is over 80% charged, but less than 100%, you will not be able to re-charge to 100%. But, if you unplug the battery when the battery capacity is not up to 80%, and plug it again it will still charge the battery to the full 100% capacity. This is to prevent the battery from over charging and damaging the battery.- Phone charging slot can charge the battery to 100%.