... IBM T40 Description:1) Battery type: Li-ion2) Voltage: 10.8V 3) Capacity: 4,400mAh and 5,200mAh4) Color: Black5) Models Compatible: ThinkPad T40 ... , T40p Series;ThinkPad T41, T41p Series;ThinkPad T42, T42p Series;ThinkPad T43, T43p Series;ThinkPad R50, R50e Series;ThinkPad R51, R51e Series ...