The Odyssey PC1200 battery was designed for cars, weighs about 40lbs, rated 44amp hours, has 78 minutes reserve at 25 amp load, and offers 1200 cranking amps in first 5 seconds. Three year warranty. It costs more, but properly treated and charged it has a design life of 8-12 years. I'm running one of these now (for just a couple days) with my alt cut-off switch and so far I'm very very pleased.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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