I'm sure you're not wrong. But I dont need 250 hours of light so I'm not going to bother carrying the extra bulk.
Understandable that it is too big for you, for me i like the way it has a usb power to charge your phone.
I think it doesn't use that much water for 250 hours, you just soak the battery for 15 seconds, ether way this product is hot and competitive i think.
I deem it worth it i.e. the bulk size of it, i think it is worth the bulk.
Regarding bulk they do these >
http://www.hydralight.net/flashlights/
edit from their facebook page
Q. Where can I buy these products?
A. The products are not yet available on the market. They are now in final production and will be available online and in retail stores in the coming months.
Q. Will these be available in my Country?
A. We have distributors set up across the globe, however initial availability will depend largely on your location until we expand our network.
Q. How long does one cell last?
A. One cell will give you roughly 200+ hours of power. That means 200+ hours of turned on light time.
Q. How many times can you dip one cell?
A. You can dip the cell as many times as required. If you wanted to use the cell for one hour each week, you could dip the cell once a week for 200+ weeks. The number of immersions in water does not shorten the life expectancy of the cell.
Q. Does the cell have to be dipped in salt water?
A. The answer is ultimately yes. However, the first 4-5 dips can be in fresh water. After this time you need to switch to salt water. This can be ocean water or table salt in tap water (5% solution). This is approximately 5gms of salt in 95mls of water. Or roughly 50gms of salt and 950mls of water will make 1L of 5% solution.
Q. Is there any harmful chemical residue?
A. No, the residue from the HydraCell is entirely biodegradable.
Q. How much will they cost?
A. Our suggested retail pricing for the product range will vary from roughly $8US to $150US, depending on the product and options selected.
Q. Can you buy spare cells?
A. Yes, you can buy spare cells. They will be available to consumers in both single and double blister packs. You will also have the option to be more environmentally friendly and refurbish a cell, rather than throw it away. This is available with the option of an exchange cartridge.
Q. How long does the product last?
A. From new, the products have an unlimited shelf life if they remain stored clean and dry.