I don't like being lied to or wasting my time. I bought this fan because I wanted to use it during a power outage, so I was happy to read in the product description that the battery lasts 8.5-15 hours on a full charge. When I got my fan I charged it fully overnight and all 4 LEDs were on constantly and I tested 3 times how long the battery would last at high power (without hesitation) by fully charging it overnight between each test charged. At the height it will take no more than 3.5 hours. I also tested it on low overnight after a full charge, and it lasted 14.5 hours on these settings. At 50% it takes 6.5 hours and at 75% it takes 4.5 hours. So I figured I had a "lemon" and sent it back to Revain, bought another and ran the same tests on this new fan with exactly the same results. Therefore, I can only conclude that a battery is capable of this and the product description is not correct. This fan lasts a maximum of 8.5 hours! I'm disappointed as I actually bought it to use with the battery only and wasted my time replacing it etc and now I have to keep looking for another fan and hope other sellers will come up with theirs claims are more honest. Unfortunately, otherwise it is a completely normal small fan.
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