The Goal Zero Sherpa 50 Power Pack is a lightweight, portable power supply for keeping your small electronics or laptop from powering down when you're away from an outlet. This Goal Zero battery packs away light and easy so it is ideal for travelling abroad or down to the local coffee shop. When using it as a power supply, the Sherpa 50 is compatible with any device that charges via USB, holding enough juice to fully charge a smartphone, digital camera or tablet a few times over, or give a full charge to a laptop. Use the included laptop tips with the Sherpa 50 so you never have to pull out your wall charger. Plug the Sherpa 50 into a USB port and you can fully charge it in about 2 hours. Or you can use this Goal Zero recharger with their Nomad 13 solar panels and charge in about 8 hours with full sun. Let the Goal Zero Sherpa 50 Power Pack carry the extra juice you need to make your electronics last longer.