Any keel that has an outer shell which is filled with lead or iron pigs or shot could have part of that filling replaced with batteries.
I think salt water batteries would be very interesting in this application. Maybe they'd work in place of a water ballast tank if the battery was designed correctly. I read that the US Army used to use them, because they could ship them empty, then fill and charge them when needed. Here's a company trying to market a new formulation: http://blog.aquionenergy.com/
Other batteries could also benefit from being below the waterline (if sealed) because they could be cooled by sea water passing by the keel.
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Posted by: cpcanoesailor@yahoo.ca
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