BRTONG 9-Cell New Replacement Laptop Battery for Dell Precision M65 M4300, Latitude D820 D830 D531, fits P/N CF623 DF192 FF232 MM165 - 12 Months Warranty Batteries capacity: 7800 mAh | Chemistry: Li-ion | Voltage: 11.1 Volts | Cells: 9 | Wh: 86 Compatible Models: D531, D531N, D820, D830, M4300, M65, M65 Compatible part number: 310-9122, 310-9123, 312-0393, 312-0394, 312-0401, 312-0402, 312-0537, 312-0538, 451-10308, 451-10309, 451-10326, 451-10327, 451-10410, 451-10411, CF623, CF704, CF711, DF192, DF230, DF249, FF231, FF232, GX047, MM165, XD735, XD736, XD739, YD623, YD624, YD626 Operation time for standard batteries: Around 3 hours, the actual operation time will depend on how much electricity is required by the device and how you use it Overcharger and Discharger Circuit Protection, CE-/FCC-/RoHS-Certified for safety, About 500 recharge cycles over the life of the battery. 24 x 7 email support, 12-month hassle-free warranty