TAUPO Laptop Battery Replacement for Dell Latitude D830 D820 D531 D531N, Precision M4300 M65, fits P/N CF623 DF192 FF232 MM165, 6-Cell, 49Wh, 12 Months Warranty Battery type: Li-ion; 6-cell; Capacity: 4400mAh/49Wh; Voltage: 11.1V Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Built-in IC chips to prevent overcharging, high electric current, voltage or temperature CE-/FCC-/RoHS-Certified. Tested under strict quality control standards, strict guidelines for compatibility 12 months hassle-free warranty service. Operation time: General 1.5-3 hours. Actual operation time varies depending on types of the device and the way it is used