Live life on your terms and enjoy things you love most by ensuring you have an adequate amount of battery life for your Respironics SimplyGo Mini portable oxygen concentrator. The standard 8-cell external battery provides you with limitless portable freedom for a staggering 4.5 hours on a setting of 2, while also delivering the lightest overall package possible. Unlike pesky oxygen tanks that need to be refilled, you will simply recharge the battery using the AC power supply, DC power supply, or external battery charger. In up to 4 hours you will have a freshly charged battery that is ready to help you conquer your daily errands. Battery life ranges from up to 6 hours on pulse setting 1 to 2 hours on pulse setting 5. The battery features an on-board battery gauge—press the black button on the backside and the LEDs will illuminate to show remaining charge. The COPD Store highly recommends purchasing additional batteries for unexpected power outages or emergencies, and if you plan on flying, the FAA requires oxygen patients to have at least 150% of flight time in battery life. The battery weighs 1.1 pounds and measures 7.9” x 3.6” x 1”. Three convenient charging options are available: AC power supply for home use, DC power supply for vehicle charging, and the optional external battery charger for charging a battery on the side.