Yes I know what you mean - I thought that as well. But they say you can get a full charge in 20 mins and I suppose when I think about the cooking I do of an evening it's not far off that - plus a top up in the morning when I'm making tea - so perhaps it'll work. More importantly it can be used to charge a battery that will then in turn charge / top up your mobile. It's a fantastic idea.
On the exhaust front - great idea! But watching the video they say it works on heat differential - not just heat - so it will charge on a geothermal spring if it has water in it but won't charge on the spring if it doesn't have water in it to heat up.
Reading into it the Army are researching the same tech to wire into combat gear so that the temp differential between the soldiers body and the outside air can charge the gear they are carrying with them - the only down side is that it doesn't work well in deserts!
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