The Sherpa 50 Power Pack is constructed to charge all your electronic gear. Whether you're using the ultra-fast, smart USB port for a phone or tablet, the 12V port for lights, or the specifically designed innovative port for laptops, it fills the power meter quickly and smoothly, charge after charge. The LCD battery monitor displays your current charge level in 20% increments. When the top segment says FULL, the Sherpa 50 is fully charged and ready to take on the world. The Sherpa 50 meets all requirements for airline carry-on and is perfect for keeping your devices charged on those long flights (please, check with your airlines for current regulations). The Sherpa 50 is capable of holding a charge for several months, but we do recommend you leave it plugged in when not in use for battery health. It uses a lithium-ion NMC battery, so you always know you'll have the most powerful charge, each and every time. The Sherpa 50 can be charged by 12V vehicle socket, a standard wall outlet or by the sun with solar panels.