Amazon.com: Replacement HP 65W Blue tip AC Adapter for HP Elitebook 830 G5 / 840 G3 G4 G5 / 850 G3 G4 G5 / ProBook 450 G3 G5, Compatible with P/N: 710412-001,
HP EliteBook 840 G3 Battery 4100mAh 11.2V
HP EliteBook 840 G3 G4 65W AC Power Adapter Laptop Charger New Genuine | eBay
New Genuine OEM HP EliteBook 840-G4, 840-G3 45W AC Laptop Power Charger Adapter - Newegg.com
HP Elitebook 840 G3 Charger
HP ELITEBOOK 840 G3 (Z3T99US) 65W Charger Power Adapter New Genuine | eBay