cectic

[ciphergoth]

After robot_mel linked to this, I started reading more. See also http://cectic.com/163.html http://cectic.com/155.html http://cectic.com/079.html http://cectic.com/069.html http://cectic.com/042.html http://cectic.com/035.html

Comments

[ciphergoth.livejournal.com]

The battery is powered by chemical energy stored in the battery; the water just kicks off the chemical reaction. The calculator doesn't say, but I'd guess it's powered by a thermocouple with one end cooled by the evaporation of the water inside - calculators need very little energy to run. In both cases "water powered" is a bit misleading to say the least.

[elfy.livejournal.com]

well, here in front of me i have a calculater which claims to run on water only without any battery... but i have to admit i'm not sure what a thermocouple is :)
http://www.ubergizmo.com/15/archives/2007/12/waterpowered_calculator.html
I guess they have a battery inside, yeah. But still :)

[zotz]

On the other hand, I do have an air-powered camera.

It has a zinc-air battery, and works very well.