As for possibility, that's something that I can't answer. What I can answer is that, it might not be necessary to do that. Unless you are in the believe that a cell phone's "life cycle" is 24 months (based on subsidizing a phone). My girlfriend had a iPhone 4 and the battery still lasted in that, her mother is now using it.
As for battery life, I can say this. Everyone uses their phones differently and has different settings applied. If you're of the belief that this increases battery life, you are sorely mistaken. I can make my battery last between 15-24 hours, maybe more with my use. That's my opinion.