Neewer Vertical Battery Grip Replacement for Sony VG-C2EM, Compatible with Sony A7 II A7S II and A7R II Cameras with 2 Pieces 7.4V 1100mAh NP-FW50 Rechargeable Li-ion Batteries and Dual Charger
Sony NP-FW50 Battery (A7,A7 II,A7R,A7R II,A33,A55,NEX-3,5,6 And 7) at KEH Camera
Nauticam External Battery Pack for Sony a7 II, a7R II, & a7S II Cameras
Sony Alpha Tips: Battery Grip Comparison For Sony A7II & A7RII - YouTube
SONY Alpha a7 II, Alpha a7R II, Alpha a7S II External Power Pack – Photo & Video Gears