[Q] Jb to Gb, really tired of battery drain.

Hi, friends, yes i have this question because i´m really tired of my battery duration.

I used gb for a long time, about 8 months, and im resistive to go to ics or jb because in all threat appears the battery duration problem.
i dont know if really normal but with the same use of the phone in gb i come aprox to 20:00hs at night with at least 20% of battery left
and in jb i can´t pass the 19:00hs with the phone on (0% of batt).

And by the other way, after try for a month ics, and for other month jb, i think that the better things comes with it (that i dont really think is so mutch) dont compare with no battery duration. So i have a "better operative sistem" but my phone is off becouse of battery!!! jejeje

Well, my question is, to go back to GB, what must i do?
Just usuall wipes and flash??? by cwm or odin? or must be careful with something more?


Thanks!! and sorry but me english