Amsahr Replacement Battery for ASUS U31, U31E, U31F, U31J, U31JC, U31JF, U31JG - Includes Mini Optical Mouse Includes Mini Optical Mouse with Retractable USB cord and ONE Compatible Laptop Battery 18 Months Manufacturer Warranty, 100% Compatible Non-OEM : Lithium Ion (Li- ion) Long Life Battery: Rechargeable with No Memory Effect and Power Surge Protection. 4400 mAh, 14.4 Volts & 8 Cell Protective Retail Packaging, Each Product is Sealed with Anti-Static Shield Sleeve. Exclusive Offering of High Performance, Long Lasting, and Durable Grade A Cell Battery Replacement Laptop Battery for Asus U31 Compatible Non-OEM Long Life, Li-ion Battery Rechargeable with No Memory Effect and Power Surge Protection. Exclusive Offering of High Performance, Long Lasting. Durable Grade A Cell Battery.