, it's very easy to install and although I've only had it for a short time it's very easy to just inflate the batteries rather than pull them out and open and check of the cells. and add water, put the lids back on, etc. Only complaint is putting the siphon in the water bottle and then taking it out, the water in the tube tends to spill out. Maybe I haven't figured it out yet. In terms of cost, given the price, you should have a very large stock because the number of parts is minimal and it can't cost very much to manufacture. It could probably sell for $30 for a good profit.
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