I hooked mine up to this one but it doesn't appear to actually be charging. I ordered a different brand to see if it would work. I had to use zinc M3 screws that I cut down to fit, my doorbell was a refurbished unit and only came with one scew, but I don't see how that would effect power throughput. I also cut my wiring down to size. Again that shouldn't have effected anything. I ended up ordering the other adapter linked in this thread, so we'll see if that actually works or not.