Charge your phone using the Biotech Wood Burning Campstove. It’s available on Amazon for $129. If you’re out camping in the middle of nowhere, and you just need to charge your phone, you can try the Biotech Wood Burning Campstove. 20 minutes of charging will give you 60 minutes of talk time. You can even boil a cup of water for less than 5 minutes. You can even roast a marshmallow while you wait.