Zopec EXPLORE 5500 Universal CPAP Battery Backup Power Supply (2-3 Nights). Automatic Switch. Uninterrupted Sleep in Power Outage! Works with All Machine with No Adapters. FAA Compliant.

After purchasing this product and found out that the battery did not work, contacted the seller and immediately the seller decided to replace the unit in order to make the customer very happy. I would recommend buying this product for anyone who uses a CPAP machine when traveling either by airplane or by boat so that you'll have a continuous usage and harmony in sleeping with the CPAP machine without any interruptions.

This backup power supply was exactly what I was looking for. Not sure why but we seem to have too many temporary power outages that last from 30 minutes to 6 or more hours. Rarely are they weather related. They seem to occur randomly but the ones that are particularly annoying are the ones that occur at night because this means my CPAP won't run and I can't really sleep very well without it. This backup is between my CPAP and the wall outlet and passes thru power (and keeps the battery charged) without affecting the use of my CPAP.

Have searched a while to find a battery backup that would kick in automatically when power goes out while using my c pap. And it didn’t cost an arm and a leg. Also can be used as back up power source for other things during power outage. Good find!

Charged it up when I got it and tried it out on my old CPAP machine with the humidifier on. Got a little over 7 hours of sleep and had 6% of the battery left. Can't sleep without the humidifier. I get dry nose and sore throat . Live in Florida so this will come in handy during hurricane season and power outages. Will charge it on the generator. Have to try it out on my new Resmed Airsense 10. Hopefully it will do as well as on my old CPAP machine.