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watchful 03-01-2012 03:07 PM

Battery charger
On my previous car, I was told to install a battery charger since I didn't drive now, with so much electronics, and after reading of one member who's car got stalled. I decided to install a battery charger.
The dealer told me it has to be a "special" one that they should install...:rolleyes:(of course) .
I was just told that they got one and it will be , are you ready ?? $349.00....:eek: !!!!! I said ,chargers cost $50-$65, they replied that it has to a special one ...anything else can cause damage that will not be covered by the warranty....!!! ????
What do you think??

robpp 03-01-2012 03:14 PM

Re: Battery charger
get a Deltran Battery tender. they are SMART chargers and i had one on my WK for 4+ years no issue.

it comes with alligator clips as well as a hard wire quick disconnect.

i have used these for the last 20 years without an issue.


watchful 03-01-2012 04:48 PM

Re: Battery charger
Thank you very much for the great advice...:)

josh3008 03-01-2012 05:07 PM

Re: Battery charger
Hey watchful,
Just make sure the battery charger you get is compatible for AGM batteries. They are a different type and if you hook up a normal battery charger it will kill the battery. I wouldn't pay the dealers price.

watchful 03-01-2012 05:13 PM

Re: Battery charger
What is an AGM ?:o How do I make sure....??

RageOfFury 03-01-2012 05:17 PM

Re: Battery charger
AGM: Absorbent Glass Mat

Info here:

A normal battery charger will destroy the AGM battery in the 2011+ GC

robpp 03-01-2012 05:25 PM

Re: Battery charger
here is the Battery tender blurb about your AGM Battery:

RECHARGING AGM BATTERIES: The primary difference between these 2 chargers is that the Battery Tender Plus was specifically designed to accommodate the charging requirements of the new, Absorbed Glass Matte (AGM) style batteries. To achieve that goal, it was necessary to modify the absorption charge mode in the following way. The Battery Tender switches to float mode when the charge current drops to 0.5 amps. The Battery Tender Plus switches to float mode when the charge current drops to 0.1 amps. The result is that for an extended period of time, not to exceed 8 hours, the Battery Tender Plus output voltage will be held at a constant voltage that is significantly higher than the float voltage.

With the Battery Tender, the switchover at 0.5 amp results in an absorption charge mode length of approximately 1 hour. During this 1-hour period, the battery charge voltage is held constant at a value of approximately 14.3 volts. Because of the slightly higher voltage recharge requirements of AGM batteries, and because AGM batteries require a longer period of constant voltage absorption, the Battery Tender Plus controls the output voltage at 14.4 volts while it waits for either the charge current to decrease to 0.1 amp or for the absorption charge mode control timer to expire. The end result is that the Battery Tender Plus absorption period is longer and at a slightly higher voltage than that for the Battery Tender.

perfectlyfrank 03-01-2012 10:31 PM

Re: Battery charger
I've used one of these on my Corvette for a few years and have been very happy. It has a setting for AGM batteries.

watchful 03-02-2012 10:28 AM

Re: Battery charger
Which one would be appropriate for the 2012 Overland?? Have you used it on yours??

perfectlyfrank 03-02-2012 10:41 AM

Re: Battery charger

Originally Posted by watchful (Post 585090)
Which one would be appropriate for the 2012 Overland?? Have you used it on yours??

I did try the CTEK 3300 on my 2012 Overland and it worked fine. I don't really need to use it on there since I drive it everyday. I use it on my Corvette since it sits in the garage most of the winter. I also recommend one of the cigarette lighter adapters so you don't have to hook it up directly to the battery.

padgett 03-04-2012 09:19 AM

Re: Battery charger
1 Attachment(s)
Just some notes, I have been using little float chargers that have a maximum output of 13.2v on my cars in the back garage for years & have slowly been converting to AGM (Optima and Duracell).

Florida (heat) is hard on batteries but I have yet to replace an AGM. I also run cars cooler (180-190) than stock (195-210).

That said my RV has an expensive inverter/charger with built in float. The recommended voltage settings are below.

I keep mine on warm Gel cel.

mot250 03-04-2012 08:58 PM

Battery Minder is another good charger that includes compatibility with AGM batteries and also has a de-sulfination (sp?) mode. Price is comparible to Battery tender models.

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