Charging/Data OTG Dock w/ USB Cable + ''2800mAh'' Replacement Battery for Samsung Galaxy S4 i9500
Charging base functions: support for data transmission charging synchronous/backup battery charging function support USB OTG function. 2800mAh replacement battery capacity-2800mAh(actual capacity is 2500mAh). Voltage: 3.7V. Suitable for replacing damaged wear and tear or loss of the original battery.