I purchased the AG-ATX20-RS for my Ultima, 680 CCA and more than enough power to turn over and start the 600HP 10.5 compression V8 after a long rest. The car hasn't truly been recommissioned yet to know how it will hold up over time, but at $287 it really wasn't any more expensive than the previous Odyssey PC1200 and the new one of those I purchased was dead on arrival.
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