I bought this just to use as a back up and camping battery for my Resmed Airsense 10.It is the 24v but you still have to buy a separate power cable.I used it for 2 consecutive nights (turned off water and heated tube) and it worked perfectly without any charging in between.As other reviewers stated, sometimes you have to plug it in a few times for the cpap to recognize its on battery power but it works fine. very happy to have this for my Resmed Airsense 10
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