okay think about FIRSTs rules. our team was penalized for not touching those triangles your robot is supposed to rest on even though it was completely on top of it!
aparently it was a safety issue (i remind you our robot was COMPLETELY over top of the traingle). now lets think what possible problem would FIRST have with sticking 12 volt batteries in water. although their are plenty of educational programs that do just this and it is possible i just don't see FIRST letting us do it (not that we cant or that it couldnt be safe).