All of us iPhone users know the feeling of having to pull the plug and get out the door before the battery’s done charging. The sleek white charging block that comes with our phone channels the charge but can’t carry it, but with the NomadPlus it can. Designed to snugly fit Apple’s USB hub, it’s a great way to turn your average wall charger into a portable battery for just $24.99.

The NomadPlus’s 1800mAh battery charges while your phone does. As soon as it’s unplugged, it’s a battery that can be used to finish the charge or top off your device on the go. It’ll work just as well for tablets and Android devices, and the built-in pass-through smart charging and overload protection makes sure whatever you plug into it gets just the right amount juice.

Pick up a NomadPlus for $24.99 at Cult of Mac Deals.