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Message: <blockquote data-quote="_CY_" data-source="post: 3973279" data-attributes="member: 7629">been using optima batteries for 20+ years and was one of the early adopters for AGM car batteries. used optima for about 10 years or so in nearly all my vehicles. until I switched to generic AGM batteries from large UPS installations after being switched out during maintenance purely due to huge costs savings with no loss in cold weather performance on my 12v cummins diesel.what was maddening .. after installing a new red top optima battery in a friend's car. about a year later, car went dead so mechanic junked that almost new optima. turns alternator went dead so of course battery does dead. all they had to do is charge up that dead optima and change out alternator. not everyone has one of these ... Snap-on MicroVAT which checks the internal resistance of batteries to determine go/no go and cold crank amps, etc. etc.  almost all of major car battery sellers will have a digital battery tester that measures internal resistance, etc.  still hard to beat good old fashion resistance load tester. [ATTACH=full]350609[/ATTACH]</blockquote>