GFI&reg; 8cell High Performance Replacement Laptop Battery for Dell XPS 15z L511Z Laptop 0HTR7 0NMV5C NMV5C 075WY2 [Li-polymer 14.8V/4400mAh] Battery type: Li-polymer; Capacity: 4400mAh; Voltage: 14.8V; 100% GFI Brand new from manufacturer. Under 100% Aging Test. Up to 500 cycles life, low self-discharge, CE/FCC/RoHS certified for product safety. 24/7 email support, 12-month hassle-free warranty To make sure you get the righly fit battery, please take a good comparison with original one on its unique appearance, and more importantly, crosscheck the Fit Part in Description. GFI'S battery makes a perfect coupling with your high-end Dell XPS 15Z battery!