something like that, it's not that bad, depends how long do you want to take a pictures or videos.
But if you want to connect everytime to check settings etc. nah ...bad idea
For now I just picked one photo and one video mode (don't really need to play around with some other options) and the battery lasted really long.
But if you want to use it frequently in wifi mode, than it can be a problem.
It really depends.
If you only take shots on a trip and you have full battery in both devices , than I think it will last that one day without problem.
Bad thing for you is that you will have to buy different mobile , or to use someone elses phone (with IOS or android 4.1 and higher).
Just came to my mind, I still have and old firmware, newer one can have wifi communication optimized a bit better.