rely on extended batteries
I ought first to declare that I would consider myself a pretty heavy user. Personally, I would like to have longer battery life, at least a whole day, but not much limited functionality. However, smartphones today are decided to introduce newfangled functionality, bells and features to try to appeal to a larger audience, sacrificing battery life for the heavy core user in the process. Seem like there still some phones with big battery like Note 3 or Razr Maxx, but I canít say anything as Iíve not touched them yet.
My only solution is using some extended batteries providing 2+ time battery life, such as a 6000mah from MPJ for S3. Though some think battery with times more extra juice for longer backup will not be safe for phone. for my personal experience they worked great, but be sure the extended battery has same specifications as that of the stock one.