Yeah - it supposedly charges at 3W with a roaring fire. Maybe not earth-shattering power but basically free.
If you have all afternoon with nothing to do but toss in pine cones or something it will give you at least a 1/2 charge. Sure beats nothing
And it will make tea or coffee the whole time, so it won't be wasted time. lol You just won't be able to bring your phone back from the dead just while making a one-pot meal. But again - free power is always a bonus.
I will try to make some time tomorrow during work to fire it up and see how I get along with it and report back here.
This is as good a cause as any to take a break from work...