Quote:
Originally Posted by Qbranch
FYI: Don't pull a me. NEVER use an aluminum bar and two threaded rods to hold a battery down... *holds up my scarred up hand* kinda burns.... 
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I wouldn't go so far as to say never do it, just be careful about it. (ie make sure everything is insulated properly) In the last three years we've used perforated steel angle and 1/4-20 threaded rod twice ('05, '07), and an aluminum plate with 1/4-20 threaded rod once ('06) and have yet to have a problem. Wingnuts on the threaded rod makes it nice and easy to change batteries too, while still keeping the battery secure. (Although I imagine something like a cotter pin or a latch would be faster)