Maybe simply loose battery cable connections or a faulty new battery.
If your primary car use is DD or weekend joyride and you want bulletproof operation, use a standard battery. If your primary use is motorsport and this is one of the few ways to lose weight and remain class legal, use a light weight AGM battery.
FWIW I have been using a 15lb AGM motorsport battery for two years. If the car will sit for more than two weeks without use I put it on a battery maintainer as long term storage will discharge it. Otherwise I have had no issues and appreciate the weight savings.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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