Warranty: 12 months; Cells manufacturer: Green Cell; Voltage: 11.4 V; Cells technology: Li-Polymer; Colour: Black; Overheat protection: Yes; Overdischarge protection: Yes; Overcharge protection: Yes; Product code: HP184; Manufacturer: Green Cell; Capacity: 3400 mAh; HP ProBook 650;HP ProBook 655;HP ProBook 640;HP ProBook 645;