I've decided to get the spare battery and charger combo instead of the extended battery. first, I'm gonna test out how long the regular lasts on 4G, then I'll test it on 3G to see if I even need the spare battery. If I were to get the extended battery, then I would have nothing to charge it with. no matter what, I'm gonna end up with two batteries, and if I want to do a quick swap, then I'm gonna need something to charge it with.
the ideal thing would be for the given battery to be able to last through a day on its own (like 14 hours). I'm trying to go for an option where I would rarely have to use my spare battery.