Reddit mentions of Neewer Vertical Battery Grip(Replacement for Sony VG-C2EM) Works with NP-FW50 Battery for Sony A7 II and A7R II Cameras

Pro battery grip replacement for VG-C2EM for Sony A7 II and A7R II. Let vertical shooting as easy as horizontal shooting

C3 key is customizable, and the switch on the grip is only designed for buttons, rather than ON/OFF for source

Works with NP-FW50 batteries. Double using time enable you focus more on shooting

With AF(auto focus)/MF(manual focus) functions

All interface block electrodes and signal pins employ pure and thick metal plating technology that provides perfect contact and conductivity, as well as great performance to resist oxidation