Battery type: Li-ion Replacement battery; Capacity: 5200mAh; Voltage: 11.1V; Cell: 6-cell; Color: Black; New battery constructed with advanced circuit board technology, including built-in thermal circuit protection for safety and stability. Grade-A cells for faster charging and more efficient power consumption Precision construction for optimal fit; CE and RoHS certification ensures quality, safety and peace-of-mind. Up to 500 charge cycles over the life of the battery Operation time: 2 - 3.5 hours. Actual operation time varies depending on types of the device and the way it is used.