I was really how well this power bank performed on a recent four-day camping trip out in southwestern Arkansas. It powered my CPAP machine all four nights for six to eight hours each, partially charged my phone one night and completely charged another camper’s iPhone. It still had somewhere between empty and 20% capacity remaining (one out of five bars on the indicator). This power bank was a much smaller, lighter and much less expensive option compared to larger offerings from Anker and others. Many of those power banks all have good reviews but they’re very expensive and were overkill for what I was looking for and just too much of a weight penalty in the Piper Cherokee that was very very close to maximum gross weight with two people and all our camping gear.