The very idea of an 8,200mAh or 16,000mAh battery pack would have seemed like total overkill only a year ago—that’s nearly two to four times the power of the largest iPhone and iPod batteries we previously tested. But the iPad’s huge screen demands considerably more power than Apple’s smaller devices, and thus an 8,200mAh battery isn’t even enough to fully refill an iPad one time. In that context, it’s worth noting…
