We've seen quite a few battery packs for the iPhone 4 with generally the same concept and specs as Scosche's new SwitchBack Surge ($80), but this particular hybrid of case and 1800mAh power cell has a few unique wrinkles. First, there's the pop-out rear stand, which is convenient for turning the iPhone 4 into an upright video player on a reasonable angle. Second is the included set of two swappable back panels, which converts the otherwise all glossy…
