Eton BoostBloc 2000mAh Portable Backup Battery Pack-Charger for Smart Phones (one full charge for most phones) and Other Devices (NBOBL2000W) Get a power boost. BoostBloc 2000 from Eto?n is a portable backup battery pack with a 2000mAh lithium Ion polymer battery that gives you long-lasting reliable power whenever and wherever you need it. Fast and efficient, when fully charged BoostBloc 2000 fully charges most smartphones so you're never caught powerless. With its sleek and elegant design, BoostBloc 2000 fits in the palm of your hand. BoostBloc 2000 features a Micro-USB DC input to use with most smartphone chargers and a standard USB port for charging any mobile device. LED charge indicator shows the battery charge level when you give it a quick shake. Whether you're on a plane or trekking in the woods, let BoostBloc 2000 provide the power you need to stay fully charged wherever you are.