I used to do something similar on my S2. With most things switched off, I frequently got 2 weeks without a charge. Others I know used some 3rd party apps to a

I used to do something similar on my S2. With most things switched off, I frequently got 2 weeks without a charge. Others I know used some 3rd party apps to automatically switch wifi / data on for a few minutes every so often, to allow apps to sync. It's fairly easy to tap things on and off nowadays. On the other hand, if you absolutely can't live without all the features turned on all the time, there are a variety of power banks and other ways to get a few more hours out of a battery.