Samsung Galaxy Note i717/T879 Replacement Battery for at&T and T-Mobile - Non-Retail Packaging Samsung original battery that does not lose its maximum energy capacity from repeated charge or partial discharge Battery Specs. Capacity: 2500 mAh Type: 3.7V Li-ion 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 Original OEM Battery, Not generic battery! See Description for all compatible models