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Message: <blockquote data-quote="curtis james" data-source="post: 1046366" data-attributes="member: 61549"><p>they are, they use a spiral but yes,,  if your going to pony up get agm there the best but optimas were not up to par, when i would get a shipment they were fully assembled and we would check voltage and quality and quite a few would not get shipped out to stores. we had quite a few come back for warranty issues. there were around 5 brands of agm type. couple years back. jci was serious about quality control at least the nw region where i was, short of the plastic body we made and assembled them in shop but optima are made in mexico and they are decent but not the one i would buy.</p></blockquote><p></p>