Yep. That's what I found. Using the RFLKT+ I get between 10 and 15% battery usage per hour without doing anything special to my phone. That's with the display off and I control the bike computer aspects through the RFLKT+. I would bet that if I turned off a bunch of other stuff (wifi etc...) it would be even better and probably in the 5-10% per hour range.

I like the RFLKT+ a lot. I don't really like their mounts.

J.