So we were fortunate to be one of Switronix featured shooters for California.
We were able to use the PB-70 battery eliminator. The biggest problem with the Sony a7s and Sony A7RII is the battery life. WIth the Switronix Powerbase-70 you can pretty much shoot all day without worrying about replacing your battery’s every 30-45 minutes with the stock batteries. We have been using these pb-70s for a few months now on the A7s with no issues at all. This is our first run using it with the A7rii and we had no issues at all.