Mobile power banks and battery-padded cases are part and parcel of smartphone and tablet ownership for many, but while these products have become smaller and more power-efficient in recent times, one startup is touting a complete game-changer that safely boosts power using eco-friendly lighter gas. This completely alternative approach, which has more than doubled its initial half-million-dollar Kickstarter goal with four weeks of campaigning still to go, offers consumers a way out from lugging hefty power devices around, and with a three-second top-up of lighter gas able to muster 11 cycles of charge to an iPhone, this could be the development that the mobile market has long since craved.