Dtk Laptop Notebook Battery for Dell Inspiron N3010 N3110 N4010 N4050 N4110 N5110 N5010 N5030, Vostro 1440 1450 1540 1550 3450 3550 3750 Fits P/n J1knd 4t7jn 312-0234 [4400mah/49wh] Battery type: Li-ion; Capacity: 4400mAh; Cells: 6-cell; Voltage: 11.1V. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. 24 x 7 email support, 12-month hassle-free warranty. Operation time for standard batteries(6-cell, 4400mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. overheating protection overcurrent protection overvoltage protection overcharge protection over discharge protection short circuit protection