Sounds both unlikely and useless even if it worked to me, but down to the numbers...
Snap pots = 200g according to Google
Baked beans are 65% water (again according to Google)
Specific heat of water is 4.2 J/gram/deg
Forget the rest, and assume we're heating 130g of water from 20degC to 90degC
Energy = 70deg * 130g * 4.2J/gram/deg
Energy = 38220 Joules
USB power (from info above) = 5V * 0.15A = 0.75 J/s
Therefore time to cook baked beans = 38220 / 0.75
= 50960 seconds
= around 14 hours.
So either my numbers are wrong somewhere or the thing doesn't work.
Ben
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Vladivostok - Denmark 2008... Finished.
Denmark - South Africa 2010-2011... Finished.
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