With the help of the Oxlife Independence Battery you can spend more time with your grandchildren, enjoying a nice dinner, or attending an extended ceremony. One battery alone will give you up to 2.75 hours of battery life on continuous flow, however if you use two batteries in the concentrator at once you can get up to 5.75 hours of battery life. You will no longer have to worry about sitting close to an outlet or rushing to your car to plug in and charge for a bit. The Oxlife Independence Battery is equipped with a large rubber tab to make it easy for you to take your battery out of the concentrator, especially when you are on the go. The Oxlife Independence does have the ability to hot swap batteries, which means you can change batteries one at a time while your concentrator is on. These batteries are all equipped with an LED indication system which tells you your remaining battery life by simply pushing the small white button on the face of the battery to see up to 4 green lights, each representing 25% of potential battery life.Battery life varies by flow rate and number of batteries used, ranging from up to 6.25 hours on pulse 0.5 with two batteries to 1 hour on continuous 2.5 with one battery.