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check the yellow pages for batterys. i found a store that only sells batteries to the industrial market. i bought a 900 AMP battery for almost a wal-mart price.
I've had the Optima red top for almost 8 yrs and typically my car sits with the battery hooked up from Nov thru March without being started or charged. It's started my car every time in those 7+ yrs.
i exercise my 73 dodge only a couple times a year. wal marts best (that sound like an oxymoron) 2 years old never let me down i do use a battery switch so it sits with a zero load/drain