The Invacare SOLO 2 Replacement Battery is a long lasting power accessory designed to increase the portability and convenience of your SOLO2 Portable Oxygen Concentrator. Designed to be easily switched out with minimal effort, this extra battery provides you with greater range and portability when out and about. Providing up to 2.5 hours of operation at 2 LPM continuous flow setting, and 4.5 hours at the lowest pulse setting, this handy extra battery can be used to significantly increase the usability of your portable concentrator. Sliding right into the back of the SOLO2 Oxygen Concentrator this deluxe battery pack is the perfect companion for anyone needing extra oxygen from their prescription oxygen unit. -Over 2.5 hours of run time at 2 liters per minute continuous flow -Lightweight, compact and easy to take along -Easily switches out of the concentrator -Recharges fully in as little as 5 hours -Can be charged while unit is running for 24 hour operation Weight: 3 lbs For approximate battery durations, consult the table below and compare with your preferred flow setting Battery Duration Pulse Mode Continuous Mode Setting 1 = 4.5 hours 0.5 LPM = 4.5 hours Setting 2 = 3.5 hours 1.0 LPM = 3.5 hours Setting 3 = 3.0 hours 2.0 LPM = 2.5 hours Setting 4 = 2.5 hours 3.0 LPM = 1.5 hours Setting 5 = 2.5 hours N/A Warranty: 1 year limited manufacturer's warranty