put the red top optima gel cell in there...you have been slapping the plates together on the other batteries ..."KILLING THEM"...the gel battery will function upside down...it will cost you about a $140.00 but worth it..the local advance auto parts carries them now.
make sure its strapped down real good and all your connections are correct meaning your wiring etc.....make sure you have relays on any longer wiring electronics pulling any kind of amps..such as bigger fuel pumps etc... run you some in line circuit breakers and make sure you have at least one good braided ground from the engine to the chassis..i run two grounds on mine for safe keeping...to protect your car from burning down..i get cold chills when i see people wiring their cars HOT.... I AM NOT SAYING YOU HAVE DONE THIS BY NO MEANS.... a poor ground and amp over load can cause a feedback problem and eat batteries also along with other electronic's,,the circuit breaker will shut the door on this type feedback..i have saw some strange stuff with this type thing......
if all is correct in your car the GEL CELL will solve your problem. its why the battery was designed.
thanks
Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "