Where to charge a battery?

[donv]

I have what is likely an earlier model (not as "pretty" as your linked one) of the Porsche Tequipment maintainer. Works great. My only bad experience with it was from forgetting to use it... left the car for many weeks while on vacation this year and didn't use the maintainer. Took the car for a short spin afterwards (not enough to charge it) and came out to a dead battery. Never had this problem when using it.

Originally Posted by dbth

http://www.porsche.com/usa/accessoriesandservices/personalisation/tequipment/n36/n105/66726b8a-4ea6-43cf-ba55-de63743389cd/

Anyone have a review on this.
It charges through the lighter.