While on the topic of battery and your consideration for this phone, may I make a suggestion or two? First, the battery life is gonna absolutely suck and especially if you are in a 4G area and you leave 4G turned on. My suggestion. Go ahead and get the external battery charger with Y-adapter.
I also purchased the $25 extended battery. So, I have three batteries in all and I rotate them in and out as the phone dies. In general, two of them have a charge at all times. And throwing in the next charged battery? It's as if Samsung realized how crappy the battery life would be so they put a cheap, thin plastic battery cover on the back of the phone so that you can quickly rip it off and have your phone going again within a couple of minutes. This has worked very well for me. I like not worrying about chargers or trying to use that annoying Juicedefender app. (No offense to the devs of this app. It really is great...just not what I prefer to use to enjoy my phone.)