[Q] GT-I9195 best solution? topic

Hello! I've got a S4 mini black edition (GT-I9195 with stock 4.4.2) and as many other users I also noticed the battery drainage problems (standby uses too much battery). Is there no way of solving the battery consumption problem without rooting/flashing custom rom? (I don't care much for breaking knox as long as the problem gets fixed). I've read several threads about this issue, but still i need some advice on what's the best solution available these days.

Thanks!