This power pack package comes with a BiXPower super high capacity (322 Wh) lithium ion rechargeable battery pack and a 24V DC power converter that is compatible with ResMed AirSense 11 CPAP machine. It may power ResMed AirSense 11 CPAP machines for 2 ~ 4 nights with the humidifier turned off. Battery running time may vary a lot, depending on CPAP machine presure and other settings. Please note that this battery is compatible with AirSense 11, may not compatible with AirCurve 11. Battery Features: High capacity (322 Watt-hour). Light weight: around 4.3 lb. Small size: 175.00 x 110.00 x 75.00 mm ( or 6.8" x 4.3" X 3"). Easy to carry: a handle bar on battery for carrying. The package comes with a mini size high efficiency power converter that converts battery varialbe voltage power to a stable constant 24V DC power. Its special output connector is specially designed to be compatible with ResMed Airsense CPAP machines. The power pack also comes with a battery AC charger that can charge battery from 100V ~ 240V AC power source. A empty battery can be fully charged in around 5 hours. This power pack package comes with a BiXPower super high capacity (322 Wh) lithium ion rechargeable battery pack and a 24V DC power converter that is compatible with ResMed AirSense 11 CPAP machine. It may power ResMed AirSense 11 CPAP machines for 2 ~ 4 nights with the humidifier turned off. Battery running time may vary a lot, depending on CPAP machine presure and other settings.