Specification: Battery type: Li-ion. Color: Black. Voltage: 11.4V. Capacity: 76Wh. New from Manufacturer. Up to 500 recharge cycles over the life of the battery Replace Part Number: Y9M6F 0Y9M6F 8K84V 08K84V Compatible Models: Replacement for Dell Alienware M15 M17 R2 ALW15M-D4736W D4501B D4958W D4728W D4505B D4725B D4746W D4725W D4758W D4738W Series Notebook Security: All ZTHY products are Certified by CE, UL for safety. Strict guidelines for compatibility, and standards compliance for environment safety Note: If the new battery is not recognized during the initial installation, please reinstall and check if the interface is fully connected. Discharge the new battery to 10-20% (not 0%), then charge and cycle 3-4 times to wake up the new battery