This Coiled Voltage Regulated D-Tap Cable from Core SWX can be used to power a7 series cameras or other electronics that use sony's NP-FW50 batteries. The built-in regulator ensures that the correct voltage is supplied to the camera, avoiding dangerous over/under-power situations. Fully extended, the coiled cable reaches 48" in length, and is 18" in length when compacted.
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Plugged it into a Core V mount battery. Worked initially the first time I powered on my a7s II, but the second time I tried it I heard a loud pop and feared for the worst. I initially thought my camera had been fried, but luckily it was still working when I tested it with an a7s battery (although the date and time had reset) What had fried was the regulator. I'm not an electrical engineer so I'm not sure what exactly happened, but when I took apart the dummy battery, it looked liked the cables connecting to one of the terminals had exploded. My advice- don't use this power regulator, especially since the circuit board is inside the dummy battery and hence inside the camera when in use. If something goes wrong like it did when I tried it, an externally placed regulator (like the Indiepro one) would be better- at least the risk of damaging the camera would be less.
I use this to power my a6000 from a gold mount battery. Wish it was a bit longer. Also wish there was a pass through for the cable on the battery grip for the a7r II, but works as advertised. Keep the battery in my cargo pocket and it works, if not a little tight. A rig mount or hip holster/backpack for the battery would be better.