[s-cars] Battery Recommendation (don't shoot)

[Cody]

Yes and no on Taka's take on what I meant. Yes, they do require a 
charger/tender that has an AGM setting, but ALSO they require different 
charging methods even in relation to the alternator. A lead acid takes a 
higher float voltage (ie alternator output voltage when the battery is 
already fully charged) than an AGM, so a typical 14.4v voltage regulator 
designed for a lead acid will overcharge an AGM. An acceptable AGM float 
voltage would be more like 13.5v to 13.8v maximum.

The big no-no is if one gets low and the car either barely starts using the 
mostly dead battery or gets jump started. If the alternator starts trying to 
charge an AGM that is at 50% you may as well kiss it goodbye. I see it ALL 
THE TIME on race cars (where AGM is popular due to weight) that sit in 
storage without a tender, then the owner impatiently only partially charges 
it then fires the car up. This is bad for a lead acid too, but they seem to 
take it a little better.

Cody Forbes
Black Forest Racing
(704) 489-0741
www.BlackForestRacing.com
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-----Original Message----- 
From: Taka Mizutani
Sent: Tuesday, September 13, 2016 6:17 PM
To: manuelsanchez at starpower.net
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Battery Recommendation (don't shoot)

I think what Cody means is that if you put an AGM battery on a charger, you
need a charger that can either auto-detect and adjust its charging cycle or
you need to manually switch it to AGM.

My battery tenders have an AGM setting that needs to be used if you have it
hooked up to an AGM battery as well.

On Tue, Sep 13, 2016 at 5:46 PM, <manuelsanchez at starpower.net> wrote:

>
> Cody,
> Ruh roh, what's the scoop on the charging issues with AGM batteries? How
> do you do permanent damage to one?
>
>
> From: Cody Forbes <cody at 5000tq.com>
> Even as a shop owner batteries are a pain. It really seems like nobody can
> CONSISTENTLY make decent ones. Interstate is one of the most ubiquitous
> high quality batteries, but even they aren't good enough in my book.
> Motorcraft (ford) seem to be the best out there currently. Stick with lead
> acid as AGM batteries require different charging methods and are quite 
> easy
> to do permanent damage to.
>
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