The water powered calculator looks like normal calculator but it use no battery. Just feed some water for the calculator and it can last for 3 months before next reload.
A cap full of water in the H2O battery can power the calculator for up to 3 months. And this calculator isn’t a wimpy, dinky thing; you get a full-function calculator with large keys and a large 12-digit display.
Product page [thanks, korokmu]
My two cents
I am very interested to know that how it works. Is it some kind of fuel-cell technology? But, water?! 
5 responses so far ↓
1 suzette // Apr 28, 2006 at 4:23 pm
Yes, I am curious of the technology too. Have they found a renewable energy? Can this replace fuels? Hmm… really interesting.
2 Neo // May 9, 2006 at 1:21 am
Wow, does that work for cars too? No need to pump petrol anymore, just pour water into our petrol tank
3 Malaysia Property // May 9, 2006 at 11:58 am
yup..renewable technology is just great….maybe it needs like RO water…or spring mineral water
4 anonymous // Feb 8, 2007 at 10:21 pm
I only could imagine how much Mili-Amps of current does a H2O battery is capable of producing, and its volts? I suggest it could be about 200 mA at 1.2 Volts DC which is REALLY low in terms of mA for most of battery powered applications. I only see this technology powering simple devices that consumes very little mili-amps such as small clocks, multi-function alarm clocks (not printers
for that you would need a truck load of water about the size of your house), calculators (see in the descritition, this battery can power THIS calculator for 3 months, a calculator like this consumes very little power, using a regular duracell battery on this same calculator should power it for a minimum of 3 years without needing to change the battery, and they are speaking of 3 months max for that battery, I guess powering a 1.2 volts incandencent regular flashlight lightbulb should only last about 30 seconds before you would be required to refill this battery with water again
5 I drank what? … « Fonixz // Sep 5, 2008 at 9:23 am
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