

Or maybe the water just releases trapped H in the puck somehow. IDK the chemistry.
Normally, if you used electricity to split the water in to 2H and O...you'd use more electricity than you'd generate. So somehow they make these pucks that send hydrogen to the fuel cell....but it's just a form of electrical storage. The real question....could you have just stored electricity in puck-sized batteries? lol. Or maybe they are much lighter and more stable until the water is added....and don't degrade over time like a battery loses charge.
as to how

TECHNICAL INFORMATION
the Puck: 1200 mAh (4 Wh)
one full smartphone charge, depending of the model
Internal battery: Li-Ion 1500 mAh (5 Wh)
a bit more than one full smartphone charge
USB-compliant output voltage: 5V DC
Charing input poert: Micro USB/Charging
Output port: USB-A
Max output power:
5 W in internal battery mode,
2.5 W in fuel cell mode
WEIGHT & DIMENSIONS
myFC PowerTrekk Charger:
Dimensions: W66 x L128 x H42 mm
Weight: 240 g
myFC PowerTrekk Puck:
Height: 20 mm
Diameter: 51 mm
Weight: 30 g (nominal)
Giftbox:
Dimensions: 182 x 107 x 67
Wood duty is done. 27 degrees.
I want another tuxedo cat so badly.
I think that internal battery was for the storage of the output of the fuel cell, Catt. Not in the puck.
The water is activating a reaction that releases Hydrogen and the H is used by the fuel cell. Really though, it $1.00 worth of energy stored in a $6.00 puckYou'd be better off carrying charged batteries. But how long would they last? How safe is it to carry them? etc.
Fuel cells are a great way to convert hydrogen into electricity. The trick is that all the hydrogen is bound up on Earth. It IS the most abundant substance in the universe though. So.....good to use for fuel if you can get it. Trick is getting it. IDK. Probably better than burning it to make electricity via steam and generator. No moving parts, etc.
We should probably come out with a lightweight wind/solar combo charger setup for the hikers....we'll make a few million and retire.
Just look at the one under "Loners" here:
http://thebean10.blogspot.com/
I'm dropping off another 48-pack of canned food to her on my way to Dad's today.
I should just have her scoop that one up for me and just bring it home. Just do it.