HP ProBook 450 G4 Battery Replacement - iFixit Repair Guide
Amazon.com: HP RR03XL 11.4V 48Wh Notebook Battery for HP ProBook 430 G4,440 G4,450 G4,455 G4,470 G4,430 G5,440 G5,450 G5,455 G5,470 G5, HP MT20, MT21 Mobile Thin Client Series : Electronics
Amazon.com: 7xinbox 11.4V 48Wh RR03XL 851477-421 851610-850 HSTNN-LB7I HSTNN-PB6W HSTNN-UB7C Replacement Laptop Battery Compatible with HP ProBook 430 440 450 455 470 G4 Series : Electronics
Amazon.com: JIAZIJIA CD03XL Laptop Battery Replacement for HP Probook 640 645 650 G4 Series Notebook HSTNN-IB8B 931702-171 931702-421 HSTNN-LB8F 931719-850 HSTNN-UB7K Black 11.4V 48Wh 4000mAh : Electronics