Review on Rechargeable 12V 11000MAh 9V 14500MAh 5V 26400MAh DC Output Lithium-Ion Battery Pack For LED Strip, CCTV Camera, Portable Li-Ion Power Bank With AC/DC Charger - Black by Andargie Waiker

I bought this as a backup and camping battery for my ResMed S9 Elite CPAP machine. I've used it at home for 2 1/2 nights. I started with a full charge and did not use the humidifier or heated hose. Expiratory Pressure Relief (EPR) is enabled on my unit. The first night was for 6 1/2 hours. The indicator read 75% full. The second night was for 7 hours. The indicator read 50% full. It lasted about four hours the third night before the charge was depleted. So, the indicator is very much like a car's gas gauge - very optimistic at the full mark, then it drops like a rock when you get to the halfway point.I'm very pleased that it will provide me with two full nights of power before I need to recharge it. Now I know what to expect when I go camping. It will be great to have this as a backup power supply for upcoming power outages with the spring thunderstorms. That gives me peace of mind that I'll still be able to sleep when a transformer goes offline due to a lightning strike.Next I'll experiment how long the charge lasts while using my CPAP machine and charging my cell phone simultaneously via the USB port. If I can get two full nights out that, I'll be very pleased.Well, using the battery for CPAP and charging my cell phone didn't last nearly so long, and I'm not surprised.On a recent camping trip, I got eight hours of CPAP use the first night and eight and a half hours the second night before the battery charge was deleted. I'm very pleased with that performance.