CPAP machines are considered as the best portable oxygen concentrators to treat sleep apnea. It is a machine that will provide the continuous flow of oxygen in order to eliminate the obstruction that occurs while breathing. These machines are equipped with batteries that provides it long power backup. The CPAP battery is a lightweight lithium Ion battery which provides power for up to 25 hours. This feature makes it travel CPAP and you can carry this amazing machine anywhere. CPAP filters are the most important part of this device which needs to be cleaned and maintained from time to time for its proper functioning. For more, visit our website http://www.sleeprestfully.com/C-100-Battery.asp .