This package comes with BiXPower BP100 battery, a high capacity (96 Wh), small size ( 180 x 110 x 22.5mm or 7.2″ x 4.2″ x 0.9″), light weight lithium ion rechargeable battery, a Special Cable that is specially designed for a ResMed AirMini CPAP machine. It can power ResMed AirMini CPAP machines. Provides 1-2 nights of continuous run-time on an average CPAP pressure, average breathing rate, optimal mask seal and with the humidifier, heated tubing and exhalation pressure relief disabled. This battery is made with high quality Panasonic cells. It also has a 5V USB port can power many small devices such as smart phones, tablets. Easy to carry. Light weight: each battery weighs only 1.4lb (or 620 g). Compact size: Single battery dimension: 186 x 114 x 22.5mm ( or 7.5″ x 4.5″ x 0.9″) The package comes with a AC Charger that can charge battery from 100V ~ 240V AC power source. A car charger that can charge battery from a 12V car cigarette socket. Battery has built-in charging controller, can be charged from any 12-24V DC power source. Travel by air: According to FAA current regulations, Lithium ion rechargeable batteries with capacity 100 watt hours (Wh) or less per battery are allowed with the passenger in carry-on baggage, but are prohibited in checked baggage. They must be carried with you. In this pack, battery capacity is 96 Watt hour, so they should be allowed to be carried with you when you travel by air.