HWG Laptop Replacement Battery (FV993) Compatible Dell Precision M4600 M4700 M6600 M6700 etc. Series, Dell Precision Mobile Workstation M4600 M4700 M6600 M6700 etc. Series Battery type: Li-ion; Capacity: 7800mAh; Cells: 9-cell; Voltage: 11.1V. 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. Every battery has passed factory testing; Durable grade A cells battery; Quality assurance. Fulfilled by Amazon.