Warranty 1 Year Voltage 10.8V Battery Type External Cells 6 Cell Cell Type Li-ion 18650 cell Battery Capacity 4000mAh Watt-Hour 43Wh Compatible with ProBook 4330s,ProBook 4331s,ProBook 4430s,ProBook 4431s,ProBook 4530s,ProBook 4535s,Probook 4435s,Probook 4436s,Probook 4440s,Probook 4441s,Probook 4446s,Probook 4540s,Probook 4545s