TWB Premium Grade Generic Laptop Battery For Asus U31, U41 TWB Batteries are the perfect choice that you can make for your computer. Very affordable, The best quality batteries on the market. Long Life durable Battery for your Laptop Voltage: DC 14.4V Capacity: 4400mAh Color: Black Replace Part Number A32-U31, A42-U31 Compatible Models ASUS U31 Series(All) ASUS U31E U31F U31J U31JC U31JF U31JG U31S U31SD ASUS U41 Series(All) ASUS U41E U41F U41J U41JC U41JF U41JG U41S U41SD ASUS P31 Series(All) ASUS P31F P31J P31JC P31JG P31S P31SD ASUS P41 Series(All) ASUS P41F P41J P41JC P41JG P41S P41SV What's in the box 1 X Laptop Battery