Original Laptop Replacement Li-ion Battery Cm03xl For Hp Elitebook 840 845 850 740 745 G1 G2 Series Hp Zbook 14 Series 4290mah - Laptop Batteries - AliExpress
Amazon.com: 7xinbox 50Wh 11.1V CM03XL Replacement Battery for HP EliteBook 840 G1 HSTNN-IB4R HSTNN-LB4R E7U24AA HP ZBook 14 CM03050XL 717376-001 : Electronics
HP Elitebook 840 G1 Battery Replacement - iFixit Repair Guide
HP E7U23AA - CO06XL 6-Cell Ultra Extended Battery for HP Elitebook 840 G1 745 G2 755 Zbook 14 - CPU Medics
Battery Fix Replacement HP EliteBook 840, 740, 745, 750, 755+, EliteBook G1, G2 or G3 - YouTube