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The long and short of it is this discussion on using fill fluids in technical light cannisters is putting the cart before the horse. A properly designed one atmosphere pressure vessel for the battery cannister is the most practical and lowest cost solution (what a wonderful combination). It certainly is less complex, and simplicity generally translates into reliability (KISS principle = Keep It Simple Stupid). I follow the KISS principle religiously for pressure vessel design, although my babblings on certain topics may indicate otherwise. A properly designed fluid filled cannister is possible. It will be expensive if it is done properly. I'm sure there are batteries around that will take the pressure (they will be specialized and expensive). Deep Sea Power & Light has a fluid-filled "suspended electrolyte" lead acid battery power supply that is rated to 1000ft for a little over $1200 (maybe more now). I know I can take a car battery down several thousand feet; the oil will float on top of the electrolyte. 'But just don't tip it over!! This thread has been good in some ways; it has gotten several people into the thinking mode on topics such as active and passive pressure compensation and some general topics on submerged pressure vessel design. That's what this list should be about? My two cents. Doug Chapman
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