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Message: <blockquote data-quote="Terrorist 5.0" data-source="post: 1580563" data-attributes="member: 30689">You are 100% right, I remembered a detail that I left out.The battery in question had 400 CCA, and was a lithium power sports battery. It was under the lawnmower section but realistically it could be used on motorcycles, ATV, snowmobile, etcThe thing with lithium batteries is that while they have a pretty big advantage in power, they are also quite volatile if they overheat. They have a safety device which will shut off the battery if it senses over voltage. This shouldn’t be an issue in a lead acid battery, but the specs showed that the battery could handle 15V IIRC. My car put out 14.8V at 2000 RPM, with a very short spike when revved (15.8-16V IIRC). That may have set the battery safety off, and caused the battery to be taken out of the equation, and the alternator pegging.It’s not dumb shit, I prefer the term “retard science” <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />I still think a high quality lead acid mower battery would be ok for one of these cars. Maybe not the most reliable, but I think it will work. I may be wrong, but I may try it again just for the giggles if I ever get another 79-04 Mustang.</blockquote>