9to5mac has reported images of the next iPhone's battery, and if they're to be believed, the battery's relatively small size could spell problems for battery life if the new iPhone has LTE.
The battery increases from 1430mAh to 1440mAh. That's a relatively tiny upgrade, but in line with the bump from the iPhone 4 to 4S (1420 to 1430). But here's the thing: The reason that we haven't seen LTE to this point is Apple's dedication to great battery life. LTE sucks the life out of phones way too quickly for the batteries on previous iPhones to last for a whole day. The hope had been that a larger, thinner, and more efficient screen, and therefore a bigger body for more battery.