BioLite CampStove 1 Wood Burning and USB Charging Camping Stove (Original Model) Turn fire into electricity! Powers most USB-chargeable devices including cell phones and smartphones on backpacking and camping trips, or during power outages using, sticks or any other biomass 20 minutes of charging with a strong fire gives you about 60 minutes of talk time on most smartphones During a full burn, the CampStove can boil 1 liter of water in as little as 4.5 minutes. CampStove weighs about 2 pounds and is about the same size as a 2-liter Nalgene water bottle An internal starter battery helps kick-start the wood fire before the stove begins generating its own power