By moving from the Galaxy S III’s 2100mAh battery up to 2600mAh for the Galaxy S 4, Samsung assured that we’d be paying close attention to just how long the GS4 would function on a single charge; will there be improvements as substantial as those numbers imply? We’ve got some new battery torture-test figures to check out, and from the looks of things, the GS4 really will deliver on those promises of a longer battery life. While the results are generally quite good overall, it’s not a slam dunk; no matter what test ...