[Mgs] batteries: lead-acid vs Absorbed Glass Mat

Paul Root ptrmgb at gmail.com
Sun Aug 17 18:45:25 MDT 2008


Thanks,
	That's just the kind of information I needed to hear.

Paul.

On Aug 17, 2008, at 6:11 PM, Stuart MacMillan wrote:

> AGM and Gel batteries have one advantage over flooded batteries, and  
> that is
> they will survive deep discharging (80%) many more times than a  
> flooded
> battery will.  So, they are best for applications where that is a  
> frequent
> occurrence.  They also need a higher charging voltage than most cars  
> (ours
> included) put out, at least 14.2v, and 13.6v is typical for most cars.
> Without the higher voltage, they never fully recharge, and their life
> shortens drastically.  You either have to kick up the output of your
> alternator, or use a special charger designed for Gel and AGM once a  
> week to
> keep them alive.
>
> IMHO, it's best just to stick with a flooded battery.
>
> Stuart
>
> -----Original Message-----
> From: mgs-bounces+macgroup=comcast.net at autox.team.net
> [mailto:mgs-bounces+macgroup=comcast.net at autox.team.net] On Behalf  
> Of Paul
> Root
> Sent: Sunday, August 17, 2008 9:24 AM
> To: MG List
> Subject: [Mgs] batteries: lead-acid vs Absorbed Glass Mat
>
> Seems my battery has died. I've been having some issues, that I
> chalked up to my recent re-wiring of the radio.
> And then some short in the ignition switch and/or light switch.
>
> I finally left it on the trickle charger over night, and it won't hold
> a charge. That's ok, it's 5 years old. I got my use out of it.
>
> The battery is an Interstate, and worked well for 5 years, even during
> last years alternator failure. I actually think that the alternator
> started going out the year before, which may have contributed.
>
> It's not a group 26, so it's a little big, but goes in. No handle, but
> I have a rope around it to help get it out. Still, I need to use a
> little hydraulic jack to help.
>
> Anyway, to the question. Is there a great advantage to going to a AGM
> battery (Westco or Optima type)? Apart from size?  I think
> James got one fairly recently. Do you like it?
>
> Would a battery for a Miata work? Or is there a different size that's
> better?
>
> Paul.
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