The BioLite CampStove is the perfect gift for the green techie dad who loves to camp. This can charge Dad's iPhone (or other small USB-powered devices) by burning twigs, not to mention he can be cooking a burger at the same time. This can be a great addition to an emergency kit when the power goes out. The device works by converting waste heat into electricity that powers a fan, creating an ultra-efficient fire through improved combustion.
It takes about four and a half minutes to boil a liter of water, and the pot weight limit is 1 gallon of liquid. This is a great off-the-grid portable cooking stove and power charger via surplus electricity, but it's a little heavier than most backpacking stoves, as it weighs more than 2 pounds. The extra weight is cancelled out if you consider you're not carrying any liquid fuel, fuel bottles, solar chargers and/or spare batteries.
Unfortunately, I couldn't find any place in Hawaii that carries this, but you can find it for $130 on BioLite's website at bio-litestove.com or llbean.com. Dad might have to wait a little for the shipping time, but it's well worth the wait.
The BioLite CampStove can charge an iPhone or other small USB-powered devices by burning twigs | Photo courtesy BioLite