> You don't really want to know what a professional photographer flash
> does if charged and fired when wet (about 50 Joules in it).


Some of the older flashes used belt battery packs, with a bunch of these
batteries:
http://www.bhphotovideo.com/bnh/controller/home?A=details&Q=&is=REG&O=pr
oductlist&sku=19185



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