Can any of you guys recommend a decent "maintenance" or "trickle" charger that works on a car that isn't driven regularly? I have researched the "Battery Tender" that is all the rage with motorcycle riders, but doesn't seem to be recommended for car batteries.

What is out there that works to keep a car battery properly charged?

THANKS!

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2000 E430 Sport (European Delivery)
Brilliant Silver/Ash Leather
Brabus Leather/Wood Sport Steering Wheel
PowerChip
Euro Front Bumper Strips, Debadged
E55 "Carbon Fiber" Door Pillar Trim
E55 Tail lights
E55 AMG/Bilstein Shocks
Eibach Springs, #1 Pads
H & R Sway Bars
Speed Yellow Calipers
18" x 8" SSR Integral Wheels
245/40ZR 18 Bridgestone Potenza RE960AS Tires

1986 Porsche 944 Turbo
88K miles