Yesoo 1900mAh Battery For T-Mobile Samsung Galaxy S II i9100 T989, Replacement Wall Charger with USB Port, Aluminum Touch Pen, Exclusive Black And Green Color Key Chain Kit Cell type: Lithium-ion Voltage: 3.7V Capacity: 1900mah This battery fit with your regular case Battery life will vary depending on your specific hardware and software configurations and network conditions. Includes: Exclusive YESOO Aluminum Touch Pen And Key Chain