After checking numerous after market battery options, I didn’t come across anything practical for photographers, for video shooters, much easier, many more options to mount it on a rig.
Went location scouting today and spotted this kid, his mom kindly gave permission to take a few snaps, my favorite shot before he realized I was talking his picture, shot with the Sony A7 and the Zeiss 55mm 1.8 at f2. Quickly becoming my favorite body/lens combination for full figure fashion/editorials and portraits.
You can already find great deals on Sony A7 bodies here on ebay and once in a while a used Zeiss 55mm shows up.
You can also get the Sony A7 discounted here at Adorama.