Alliboo New Laptop Battery for Dell XPS 15z L511z fits: 0HTR7 0NMV5C NMV5C - [Li-Polymer 8-cell 64Wh] Battery Type: Li-Polymer; Voltage: 14.8V; Capacity: 64Wh/4.2Ah; 8 Cell. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. About 500 recharge cycles over the life of the battery. Overcharger and Discharger Circuit Protection, CE-/FCC-/RoHS-Certified for safety Operation time for standard batteries(eg, 4400mah): Around 3 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Warranty: 12 warranty, 30 days money return guarantee, 24 x 7 email support.