Abcent 3200mah External Backup Battery Charger with View Stand Case for Samsung Galaxy S Iv S4 I9500 Free Shipping (black) The output rate:5v/1A input current 1000mAH cycle life:OVER 500times; DC charging time:4hours The powerful 3200mAh built-in battery can effectively extend the battery life of your Galaxy S4. It can easily add 7 hours of talk time and 8 hours of web browsing time. Made with state-of-the-art technology, he allows users to use any function button with case one, sync and charge with the case equipped, and visualize current battery levels (of the case) via the sky-blue 4-LED battery level indicator.And transparent window lets the time, date, power, signal, email, music are viewable. The battery case is designed to allow for charging of the phone and the case without taking the case off. When connected to the charger, the battery case will allow your SAMSUNG S4 to fully charge, and then charge the built-in battery. Please note that due to additional batteries being charged, the overall charging process will take longer than charging just leave our phone alone.