The package comes with a BiXPower lithium ion rechargeable battery and a 24V DC converter. The battery has super high capacity: 223 watt-hour. (Capacity was 159 Wh, upgraded to 188Wh from July 2019, then upgrade to 223 Wh from Oct. 2019, with same dimensions and weight ). The Battery is IEC /UL 62133 Certificated, made with high quality <b> Panasonic</b> Li-ion battery cells. <br> <br> Battery can run 1 ~ 3 nights for ResMed AirSense 10 machine with the humidifier turned off. <br> <b>Specifications:</b> <br>Capacity: 223 Watt-Hour* (Capacity was 159 Wh, upgrade to 223Wh since Oct 2019, with same dimensions and weight)<br>Battery Cell: Panasonic (18 cells) Lithium-ion <br>Charging Voltage: DC 12 - 19V <br>Output Voltage: 15V/19V + 5V USB Port <br>Maximum Output Current: 4.75A <br>Charging time: 4-6 hours <br>Size: 10.6" x 5.7" x 1.3" <br>Weight: 1340g <br>Power Indicator: 4 level LED indicator <br>Built-in Protection Circuit: - Over-charge <br> - Over-discharge <br> - Over current <br> - Over temperature <br> - Short circuit protection <br> <br> Included in Package: <br>- Battery x 1 <br>- AC Charger & power cord x 1 <br>- Car Charger x 1 <br>- 24V DC Converter for ResMed S10 Machine x 1<br>- Power Output Cable x 1 <br>This battery pack is compatible with the following CPAP Machines: AirStart 10, AirSense 10, and AirCurve 10 machines manufactured by ResMed. It may work with many other CPAP machines that need 24V power and use the same size power connector.