This is my second battery pack, I'll admit. However, I mistreated the first one pretty badly and it still lasted two years. It probably would still be working, but early on I kept picking it up by the cord. I do not recommend doing that as it will eventually pull it loose and it will not function. My second one I've reinforced just in case... (totally my fault on mistreatment)I drive OTR truck, and I use the battery pack with a humidifier on my CPAP. It lasts for about 7 hours, two nights, if I don't charge it. I do usually charge it while driving down the road, and it takes about 2 to 5 hours pending on how long I used it before charging. I use it about 60 to 70 percent of the time I'm out (at least) and I'm only home about 4 to 6 (max!) days a month.

My wife has ALS and uses a BiPap. I wanted something to power her Bi-Pap in case of power failure. That's what I got. Neatly designed and compact, it's ready to go when I need it. A well made product.

I have the DeVilbis standard clap machine. This back up battery allows me to go anywhere and supports me during our frequent power outages. I have also purchased the Z1 HME. I need humidification on my cpap and the HME allows me to travel anywhere with out looking for distilled water. I'll be traveling in a travel travel in the near future and have purchased a battery inverter, the inverter will allow me to use the cpap machine off the trailer battery without draining when I don't have power and allows me recharge the battery while I'm traveling. Great system

I was tired of lugging around a car battery for weekend campouts. Took a chance on this. It is small - about the size of a softball. I tried it at home first after charging it. I did not mark the hours used, but I made it three nights on one charge!! Awesome, and just what I need!

Arrived on time, product meets or exceeds my expectations. Thank You