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AGM batteries

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  AGM batteries Christopher Howard <christopher@librehacker.com> - 2025-11-03 06:40 -0900
    Re: AGM batteries bp@www.zefox.net - 2025-11-04 04:13 +0000
    Re: AGM batteries "chrisnd@privacy.net" <chrisnd@privacy.net> - 2025-11-04 09:17 +0000

#6605 — AGM batteries

Hi, I live in a cold weather region where temps drop to -40 deg F or
colder during the worst part of the winter, and I don't have a garage. I
need to replace the battery in my wife's Suburban which is driven around
three times a week. Battery store is recommending a quite pricey AGM
battery with high CCA, and also to install a trickle charger. But part
of me is still wondering about the cost-benefit part of it and if maybe
I should just get one of the less expensive non-AGM batteries with lower
CCA. I think I'll install the trickle charger in any case, as I already
have a spare one I bought a while back.

-- 
Christopher Howard

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#6606

Christopher Howard <christopher@librehacker.com> wrote:
> Hi, I live in a cold weather region where temps drop to -40 deg F or
> colder during the worst part of the winter, and I don't have a garage. I
> need to replace the battery in my wife's Suburban which is driven around
> three times a week. Battery store is recommending a quite pricey AGM
> battery with high CCA, and also to install a trickle charger. But part
> of me is still wondering about the cost-benefit part of it and if maybe
> I should just get one of the less expensive non-AGM batteries with lower
> CCA. I think I'll install the trickle charger in any case, as I already
> have a spare one I bought a while back.

Perhaps take a combo approach. Battery output goes down with temp, cranking
power goes up as temp goes down. I think nameplate ratings on batteries
are for zero degrees F. You have to oversize the battery, use thinner 
oil, and try to keep things warm. At -40F keeping things warm might be 
worth considering. The trickle charger is a good thing, but at minus
forty  it won't change things much. Maybe add a block heater?

hth,

bob prohaska
 

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#6607

On 03/11/2025 15:40, Christopher Howard wrote:
> Hi, I live in a cold weather region where temps drop to -40 deg F or
> colder during the worst part of the winter, and I don't have a garage. I
> need to replace the battery in my wife's Suburban which is driven around
> three times a week. Battery store is recommending a quite pricey AGM
> battery with high CCA, and also to install a trickle charger. But part
> of me is still wondering about the cost-benefit part of it and if maybe
> I should just get one of the less expensive non-AGM batteries with lower
> CCA. I think I'll install the trickle charger in any case, as I already
> have a spare one I bought a while back.
> 
 From my motorcycle experience, AGM batteries are absolute winners!

HTH

Chris

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