This doesn't help you...but I bought a trickle charger at Sears for $30. It's 'smart' so it won't blow your battery up. AC though....no solar cells or dilithium crystals to power it.
As far as $100 batteries go....Walmart. Replaced my Cayman's battery with a $100 battery from WallyWorld two years ago and it's a champ. I drive the Croc probably 2 or 3 times a week. (The trickle charger is for my Boxster).
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Current: 981 Cayman
Former: '02 BS and '08 C
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