MAIN OVERVIEW FEATURES: Application/Usage: NotebookBattery Rechargeable: YesBattery Size: Proprietary Battery SizeBattery Chemistry: Lithium Ion (Li-Ion)Weight (Approximate): 14.50 ozCompatible to OEM Part Number: PA3331U-1BASPA3331U-1BRSEnvironmentally Friendly: YesEnvironmental Certification: RoHS