Anyone experience the same thing? I posted this back when I had a 4S and now its still the same on my 5 despite vibers claims of it not using much battery. I find that even with the app closed and not in the fast switch menu it will still drain the battery. I get about 6-7 hours of use on my iPhone 5 with viber on and easily 8-10 hours without it. And thats with just having the app installed and not being actively used.
I have it installed on my 3GS but actually not used it much.
But, it could be you have conflicting Apps on the phone, have you ever tried to have a clean iPhone and only install Viper and see if it is still the same?
Also, is Viper Location Aware, Location Services can eat your battery.
Yup I only do clean installs when I first setup my phones and never restore from backups.
Not sure if you are just misspelling viber to viper but is there a way to stop viber from using location services?