Isn't that the "float" mode, or no?

Float: Voltage is reduced and held constant in order to prevent damage and keep batteries at a full charge.

 

Could be but I can't be sure. It makes sense but if it's more than constant minor voltage feed it will cook the battery.

I would first check with the maker of the charger

 

The classic maintainer is the Battery Maintainer by Deltran, The smallJunior 0.75A wart is plenty fine. The OEM units are fine too.

 

I believe the Deltran and the Interstate are the same unit.

One makes for the other.

Don't use alligator clips. Get a rubber trailer hitch connector at an auto parts store, get two large round electrical eyelets and solder them on to the lead, connect to the battery such that the exposed connector on the battery plug is the negatine (-) terminal, and you are in business.

You can then easily connect/disconnect the tender.

Leave it on all the time and you'll never have a battery problem.

 

+1. I use a Battery Tender for my Ford GT - which is idle quite a lot. From what I read, this is the benchmark standard for these devices. I strongly recommend it - and I believe they will warranty damage as well. I also gifted a buddy of mine a quadruple unit which he uses on his two F-cars, a continuation Mustang (or whatever you call those 'better than original' things, and a Maserati (yes, he runs in different socio-economic circles than I!), and he swears by it as well.

 

I don't think there is anything 'wrong' with clips or the cigarette lighter thing. The current running through these devices are quite modest. However, to make it simple and safe, I bought, installed and use this for my GT:
http://www.cooltechllc.com/servlet/Detail?no=4
You may be able to adapt it to Porsche's as well. And Kendall is a good guy.

 

The Battery Maintainer comes with eyelet connectors and alligator clips. They both disconnect easily. A cigarette lighter accessory is also available.

 

Seems like the Duracell model I bought is the wrong way to go. Maybe I'll call Duracell to be sure. Otherwise, I'll pick up one of the units you guys recommend.

 

I use tenders on all my cars, but my 06 has already needed its battery replaced.

 

Here's what I use -
http://batterytender.com/product_inf...0f86ea102f6242

 

c'mon. ctek makes oem unit $60 most everywhere. get the cigarette lighter connection. don't be silly here

 

Was that treated as a warranty item? I was pleasantly surprised that my 06 batt was warrantied, replaced for free.

 

well since my car has had so much done to it, I never take it to the dealer, I just bought a new one.

 

Wow, you can CHARGE your baatery using the cig lighter? If ture, that's pretty cool.
IMO, it's overkill unless you stor the car for months. These cars were designed for unregular usage from the start, the OP only had a problem because he left an electric device turned on...

 

It's more like storage for weeks not months that may cause your battery to discharge completely. The battery is weak - check the many posts from users who have had to replace. Porsche may even deny warranty replacements if car is driven less than 6,000 miles in 12 months. If the car isn't a daily driver, best bet is to use a trickle charger - will save some headaches down the road.