I post too Much on Here!!
- Mar 25, 2011
I have the cheap Amazon dummy battery. I've used it on my 5D MK IV, and my R. I had a different one I used on my SL-2. All worked fine with the case relay. I originally bought it to provide continuous power for the Solar Eclipse, it worked great for that while connected to my USB battery pack.No, there is a rubber flap/piece on all Canon battery doors for a dummy battery wire. Hard to spot but it is there. Canon sells their own LP-E6 dummy battery and AC to DC supply, but it is really over priced.
I had a Case Relay too but it was very over priced and uses the same cheap dummy battery (exact same) you can buy for 20 bucks on Amazon, and it failed me any time I used it below 40 degrees or up above 12kft. I might have had a bad unit but their support was terrible when contacted, and said it could not do what I wanted even though their spec sheet said it was more than capable. Next, I got a dummy battery and made my own 8.2V regulator circuit for about 10 bucks that works better and has higher gauge wire. I use this for 8+ hours of high current shooting (time lapse in cold temps and high altitudes).
Lots of options if a battery grip is not enough for you is the bottom line, but you might have to put it together yourself.
I don't think I've used mine except in mild weather, I can't speak to low or high temperatures.