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After 6 years my optima blue top is giving out. Pretty sure my alt going bad fried it somehow. Although today it seemed to start fine everytime. Lol anyways i decided to go with a small battery. I went with the odyssey pc680 and modified it for car terminals. I haven't read much on anyone using a smaller battery here but the miata guys freaking have like 1lb batteries and start the car no problems all day long. I want to go small battery but 1lb is nuts. Lol i went with a 15 lb one because people seem to get at least 3 years from them on car before they leave the lights on and ruin the already weak battery. Anyone running small battery?