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battery powered water bottle Answered


I'm interested in possibly modifying a water bottle with an attached battery and some heat coils, so that it could slowly melt snow in to drinkable water.  When I hike during the summer I carry little water because I'm refilling from streams regularly, and I'd like to do the same thing during the winter.  I don't normally build things on my own, but in this case I can't find any product like this.  I recognize that doing this requires quite a bit of power, so I'm not sure if it will end up being feasible or not.  I'm willing to carry quite a few batteries, however.  For a big mountain ascent, it's not uncommon to carry 4-5 liters of water, so we're talking about 10 lbs of water.  So even if I had to swap out batteries a few times, it would still be worth it to do that.  Any thoughts on the feasibility of this idea, and if so, how to proceed with it? 




To melt a litre of water, you'll need ~333kJ. That's about 93Wh. So a 9V battery will have to supply 10A for more than one hour! Quite a big battery for one litre. And that's just for converting 1 litre of 0°C ice into 0°C water. Colder ice has to be heated up first...

Also, if you drink the water, you'll not have to carry it any more (other than inside your body). So for every carried litre you drink, your stuff will get one kg lighter. If you use batteries, you will still have to carry the depleted batteries all the time. (Same for any chemical heater)

Thanks for the calculations. Yes, a chemical heater may be the way to go. I'll try the suggestions above, and see how it works!

I'm interested in your results.

I would suggest running said newly found water through a filtration system....snow, like rain, condenses around a dust or other particulate before falling.

I'm not sure a battery-powered heater would cut it.

How about putting the bottle in a "cosy", with pockets inside for hand-warmers, the kind of things where you pop a metal disc inside and they release heat as they crystalise?

Great suggestion! I spent some time investigating this today. I'm going to try these hand warmers, which can work even when submerged:

I also ordered some disposable hand warmers, and a MRE heater as well.

I'll let you know how well these work!

Cool. Take photos, write an instructable.

I was going to suggest the hand warmer guys as well