Darkstorm - have you tried charging your new battery over a 12 - 15 hours with an external battery charger?
Sometimes new batteries (light weight or not) require an initial, steady state charge over a protracted time frame that a car alternator cannot give...
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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