Hi, Here is a cable I made for the Epic, I recently saw many solutions so I thought I would add mine. I used an angle connector to give more room for the epic in the movi and JST connectors (XT60 connectors are a little bit heavier but have the advantages of being fool-proof. With the JST connectors you have more risk to reverse the polarity. Even though the Epic has a reverse polarity protection, it might be a good idea to change for a XT60 connector...) I can plug a lipo or 2 V-mount battery on a custom made plate.
Would you sell one with bare wires on the end and I could add my own battery connector, i use ec3 and ec5