Samsung Original Genuine OEM Samsung Galaxy S II Hercules T989/Skyrocket I727 1850 mAh Replacement Li-Ion Battery with NFC Technology - Non-Retail Packaging - Silver It is recommended to fully drain and fully charge the battery especially during the first 3 charging and discharging cycles, doing so may greatly improve the overall life of the battery. OEM Part Numbers: EB-L1D7IBA / EB-L1D7IBAB / EB-L1D7IBABSTD / EBL1D7IBA Battery Capacity: 1850mAh, Voltage: 3.7V Original OEM product It is recommended to fully drain and fully charge the battery especially during the first 3 charging and discharging cycles, doing so may greatly improve the overall life of the battery. ^OEM Part Numbers: EB-L1D7IBA / EB-L1D7IBAB / EB-L1D7IBABSTD / EBL1D7IBA ^Battery Capacity: 1850mAh, Voltage: 3.7V ^Original OEM product