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Patco sells their underwater heaters and lights with submersible 
batteries which they say are good to 160'. The limit seems to indicate 
that they are not completely compensated, however.

 Jim

On 9/14/98 9:15 PM rick@vi*.co* wrote:

>Has anyone used pressure compensated gel cell batteries underwater
>before?  I heard about the U.S. Navy evaluating this technique a while
>back. The pressure compensation technique involves placing a needle port
>in the top of the battery case and injecting mineral oil into the
>headspace of the battery case.  Once sealed terminal contacts are
>attached,the batteries supposedly can be used underwater without a
>sealed pressure housing. 
>
>Rick
>South Florida
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