I am very happy with this DC coupler. I use it with a 30000 mAh power bank and it works with my Canon M3 camera for several days without any failure. I am a former Canon T2i owner and made a feature film in 2011. I had about 14 batteries. They lasted about 1 hour when we were shooting. We constantly recharged the batteries on set when they ran out. Not anymore, we can just take pictures without worrying about batteries. I also have several 20,000 and 18,000 mAh units that can power flashlights and other devices including phones. You just have to get used to the cable coming out the bottom of your camera and connected to the power bank battery.
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