CM03XL Original Battery HP EliteBook 850 G1 850 G2 740 G1 740 G2 745 G1 - Newegg.com
elitebook 840 g2 m.2 ssd size and compatible cards - HP Support Community - 5117937
Amazon.com: Replacement Hard Drive HDD SSD Caddy Frame Bracket for HP EliteBook 820 840 845 850 855 725 740 745 750 755 G3 G4 ( Not fit G1 G2 Model or Any Other Model ) : Electronics
Solved: Adding M.2 SSD to EliteBook 850 G2 (J8R65EA) - HP Support Community - 5920770