Last month, budget charging accessory maker Aukey released PB-N30, the first external battery with a female Lightning recharging port. For only $15, PB-N30 seemed like a steal given its 3,600mAh capacity — just right for use with any iPhone — but wasn’t capacious enough for power-hungrier iPads. So Aukey has released PB-N28 ($25) as a solution for tablet users, remarkably equipping it with […]