Battery extenders and portable batteries are nothing new. Charge the juice box, plug it into your notebook, and bam: you have extra battery life. Though it seems like a fairly simple concept, there’s always more than one way to skin a cat, and let’s face it; some ways can be more efficient than others. That’s what Gbatteries is claiming with its BatteryBox portable battery. It looks like any other portable battery, but the company claims that it’s what’s under the hood that sets it apart from the competition.