Bad battery. I'm on 2 years with my trickle charger for 3 months at time and the battery is still fine as far as I can tell. Did you plug the charger into the cigarette lighter by the armrest?
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2006 Boxster S
Midnight Blue/Metropol Blue Top
Bi Xenons
Auto Climate
Bose with Windstop
CD Changer
Heated Seats
Clear Sidemarkers
Midnight Blue Side Vents
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