For years Just Mobile has been making things out of aluminum, nice and helpful things too. Its aluminum-made rechargeable backup battery packs were and continue to be one of the nicest looking on the market. To grow and improve its line of electricity harnessing banks, Just Mobile's most recent release includes the Gum++ (or Gum Plus Plus), a 6000mAh external backup battery follow-up to the aluminum-made Gum Plus that boasts an ultra-portable form factor that features a high-powered USB output port capable of filling up smartphones, tablets and just about any inanimate object that's got a USB port on it with extended hours of usage.

Redesigned with a hard-wearing ABS plastic shell, the Gum++ is supposedly more durable than its aluminum predecessor and can charge your smartphone up to three times over. As always, we conducted our own testing using multiple devices to find out if any of these claims really stick. Our full review awaits!