QuantumSphere, Inc. announced the availability of its MetAir(TM) Ranger series for on-demand back-up power in off-grid and emergency applications. While already offering the energy density of any commercially available primary battery at the lowest cost per kilowatt hour, QSI's MetAir(TM) Ranger portable power system has received independent validation that it surpasses the industry's 72-hour emergency preparedness benchmark. The system achieved an unprecedented 108 hours -- four and a half days -- of instantly accessible emergency power. The MetAir Ranger, a 3.2 kilowatt hour battery system weighing less than 25 pounds, has a replaceable power cartridge, yields energy densities of 352 Wh/Kg, and costs per kilowatt hour of less than $200. The MetAir(TM) Ranger Series portable power product is ideal for first responders, military, home, school, and business emergency preparedness. The MetAir(TM) Ranger, a 3.2 kilowatt hour battery system weighing less than 25 pounds, yields energy densities of 352 Wh /Kg and costs per kilowatt hour of less than $200. The MetAir(TM) portable power systems utilize QSI's proprietary cathode technology that results in industry performance. While one MetAir(TM) Ranger system is about the size of a single deep cycle lead acid battery, it is roughly half the weight and has 11 times the equivalent energy per kilogram. It is also designed to easily accept replaceable power cartridges once the initial system is "air" activated and used. The MetAir(TM) Ranger Series is essentially a "plug and play" box of portable energy and requires no external energy sources to stay charged. The MetAir(TM) Ranger has an optional 150 watt 110 volt AC inverter with two outlets and a USB charging port. The MetAir(TM) Ranger contains no hazardous materials or combustible fuels and, unlike large format Lithium batteries, is approved for transport by the Department of Transportation as non-hazardous material.