The Philips Respironics SimplyGo Mini Standard Lithium Ion Battery is designed to last 4-5 hours.
It is rechargeable and can charge on AC and DC power supplies. It has a maximum charge time of 4 hours and the battery duration on pulse setting 2, is 20 BMP*. The watt-hour rating per standard battery 3.4Ah x 3.6V x 8 cells is 97.9 Wh per standard battery.
Weighing only 0.50 kg, the battery is 20.1cm x 9.1cm x 2.5cm in dimension.