Tips: Please check carefully about your laptop model name/battery part number/battery shape and size to make sure you purchase the correct battery. Specification: Battery type: Li-ion Voltage: 10.8V (Compatible with 11.1V) Capacity: 4400mAh Cell: 6 Cells recharge cycles： 500 Operation time: Around 2-3 hours Compatible Models：( Ctrl + F for fast search ur laptop model) FOR LENOVO E430 B590 M490 V385 B490 B495 B580 B595 E435 E49 E530 E535 M480 M495 M580 M595 V380 V480 V485 V580 V585 K49 B480 B485 B585 Compatible Part Numbers： FOR LENOVO 121500047 121500050 3ICR19/65-2 45N1042 45N1043 45N1044 45N1048 45N1049 45N1055 L11S6Y01(3INR19/65-2).