Review on 🔋 O2COOL Treva Portable Battery Operated Fan - 10 Inch Blades - Smart Power Air Circulator for Camping, Travel, and Indoors Use - Includes AC Adapter, Rechargeable Batteries, and USB Charging Port by Smiley Edwards

This is a good size for our camper for moving air especially to keep our dogs cool. But when we can't plug it in, the built-in battery only lasts 4 hours at low speed. We bought the necessary 8 D cell batteries for it, charged the batteries but it barely lasted 8 hours on a low charge. The D items were $13, so the price is going up fast! The kit includes a plug for charging the battery, but that doesn't help us when we're relaxing in a state park with no power. There is also a cigarette lighter / car plug for charging.