The ETX36C/D has 320CCA; weighs 3.9 pounds; has 12.4Ah capacity and has the full battery management system with a 2 year warranty. The cost is $369. The ETZ14C has 330CCA; weighs 2.5 pounds; has 6.8Ah capacity and has the battery management system minus over discharge protection and excessive cranking protection so it will not cut off in cold weather starts with a 1 year warranty. This battery was designed for high cranking amps in the cold. The cost is $259. The ETX36C and the ETZ14C are both the exact same physical size but it is smaller than the ETX36D. https://earthxbatteries.com/product/etx36d/ https://earthxbatteries.com/product/etx36c/ https://earthxbatteries.com/product/etz14c/