A7s Battery Grip
 

The Sony one is a bit pricey - anyone using other makes such as the one below?

Meike MK-AR7 Built-in 2.4g Wireless Control Battery: Amazon.co.uk: Camera & Photo

Pete

Re: A7s Battery Grip
 

I have the Neewer version and it works flawlessly.
However, double nothing is still nothing.
And, I've tried a half dozen aftermarket batteries
all with less or only slightly longer life regardless of mAh rating.

The solution I found for unattended Video of over 3 hours
was a Neewer dummy battery with Small Rig Sony 970 battery plate
and an Odyssey 7Q+ with Indigo dummy battery plugged into a Poweradd power bank.

Re: A7s Battery Grip
 

Well I ended up buying it and it seems ok - nice to go twice as long without changing battery :)