I have the grip, I have all the batteries, including the enel4's so now it's just a matter of testing. . . I was waiting for the special bl3 door which there are none of in the entire USA, they are gone and on back order. They cost about 40 bucks and I see there's one on ebay for 80 and there's still a couple days left.
Anyhow, mine will be here tomorrow so I can begin testing the enel4 AND enel3. the biggest issue I see is that NO MATTER WHAT, YOU HAVE TO USE THE ENEL3 IN THE BODY, TO GET FULL BENEFIT OF THE GRIP, if the enel3's cant stand up to the cold, your not going to get full performance. I can live with that, mainly i'm trying to figure out a reliable system. . .
BTW, take a couple enel3's out and throw them in your freezer, after an hour take them out, shove them in your camera and check their power. . .