IBM/Lenovo Thinkpad T400S Battery 51j0497 Li-ion 51J0497 T400s Compatible with FRU 42T4702, FRU 42T4791, 51J0499, FRU 42T4819 Lenovo FRU 42T4797 Laptop Battery,Lenovo ASM 42T4796 Laptop Battery,Lenovo ASM 42T4703 Laptop Battery,Lenovo ASM 42T4756 Laptop Battery,Lenovo 42T4733 Laptop Battery High Quality Laptop Battery 11.1V 4400mAh 6 cell Designed for LENOVO ThinkPad T400s Series,ThinkPad T400s 2808,LENOVO ThinkPad T400s Series,ThinkPad T400s 2823,ThinkPad T400s 2801 1 Year Warranty