Subject: Re: [Shop-talk] AGM batteries: Protect from freezing?

From: Philip Ethier <[email-masked]>
Date: Fri, 14 Nov 2025 01:55:48 -0600

--===============5564238101645068463==

--00000000000083526706438955d7
Content-Transfer-Encoding: quoted-printable

On Fri, Nov 14, 2025 at 1:34=E2=80=AFAM Philip Ethier <[email-masked]> =
wrote:

> Absorbed Gas Mat batteries:
>

OOPS. Absorbent glass mat

>
> If you leave a vehicle outside all winter in a cold climate without
> charging the AGM batteries, will they be ruined by the cold?
>
> I know that regular lead-acid batteries can freeze up, but I don't know
> about AGM batteries.
>
>
> --
> Phil Ethier, West Side, Saint Paul Minnesota, USA
> 2006 Gulf Stream Conquest Super C, 8.1, white
> 2011 Cayman 2.9 PDK, white
> 2021 Ford F-150 3500cc twin turbo, white
> 1991 Caterham 1700 Super Sprint, not white
> www.mnautox.com
>
>

--=20
Phil Ethier, West Side, Saint Paul Minnesota, USA
2006 Gulf Stream Conquest Super C, 8.1, white
2011 Cayman 2.9 PDK, white
2021 Ford F-150 3500cc twin turbo, white
1991 Caterham 1700 Super Sprint, not white
www.mnautox.com

--00000000000083526706438955d7
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_defa=
ult" style=3D"font-family:monospace"><br></div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Nov 14, 2025 at 1:34=
=E2=80=AFAM Philip Ethier &lt;<a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"ltr"><div><div style=3D"font-fami=
ly:monospace">Absorbed Gas Mat batteries:</div></div></div></blockquote><di=
v><br></div><div class=3D"gmail_default" style=3D"font-family:monospace">OO=
PS.=C2=A0<span style=3D"color:inherit;font-size:inherit;font-style:inherit;=
font-variant-ligatures:inherit;font-variant-caps:inherit;font-weight:inheri=
t;font-family:&quot;Linux Libertine&quot;,Georgia,Times,&quot;Source Serif =
4&quot;,serif">Absorbent glass mat</span></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,2=
04);padding-left:1ex"><div dir=3D"ltr"><div><div style=3D"font-family:monos=
pace"><br></div><div style=3D"font-family:monospace">If you leave a vehicle=
 outside all winter in a cold climate without charging the AGM batteries, w=
ill they be ruined=C2=A0by the cold?</div><div style=3D"font-family:monospa=
ce"><br></div><div style=3D"font-family:monospace">I know that regular lead=
-acid batteries can freeze up, but I don&#39;t know about AGM batteries.</d=
iv><br clear=3D"all"></div><div><br></div><span class=3D"gmail_signature_pr=
efix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature"><div dir=3D"=
ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div><span style=3D=
"color:rgb(0,0,0);font-size:12.8px;background-color:rgb(255,255,255)"><font=
 face=3D"monospace">Phil Ethier, West Side, Saint Paul Minnesota, USA</font=
></span></div><div><span style=3D"font-family:monospace;color:rgb(0,0,0)">2=
006 Gulf Stream Conquest Super C, 8.1, white</span></div><div><span style=
=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)"><font face=3D"monos=
pace">2011 Cayman 2.9 PDK, white</font></span></div><div><span style=3D"col=
or:rgb(0,0,0);background-color:rgb(255,255,255)"><font face=3D"monospace">2=
021 Ford F-150 3500cc twin turbo, white</font></span></div><div><span style=
=3D"background-color:rgb(255,255,255)"><font face=3D"monospace">1991 Caterh=
am 1700 Super Sprint, not white</font><br style=3D"color:rgb(0,0,0);font-fa=
mily:verdana,geneva,lucida,&quot;lucida grande&quot;,arial,helvetica,sans-s=
erif"><a href=3D"http://www.mnautox.com/" style=3D"color:rgb(0,24,57);font-=
family:verdana,geneva,lucida,&quot;lucida grande&quot;,arial,helvetica,sans=
-serif" target=3D"_blank">www.mnautox.com<br></a></span><br></div></div></d=
iv></div></div></div></div>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_s=
ignature"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"lt=
r"><div><span style=3D"color:rgb(0,0,0);font-size:12.8px;background-color:r=
gb(255,255,255)"><font face=3D"monospace">Phil Ethier, West Side, Saint Pau=
l Minnesota, USA</font></span></div><div><span style=3D"font-family:monospa=
ce;color:rgb(0,0,0)">2006 Gulf Stream Conquest Super C, 8.1, white</span></=
div><div><span style=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)"=
><font face=3D"monospace">2011 Cayman 2.9 PDK, white</font></span></div><di=
v><span style=3D"color:rgb(0,0,0);background-color:rgb(255,255,255)"><font =
face=3D"monospace">2021 Ford F-150 3500cc twin turbo, white</font></span></=
div><div><span style=3D"background-color:rgb(255,255,255)"><font face=3D"mo=
nospace">1991 Caterham 1700 Super Sprint, not white</font><br style=3D"colo=
r:rgb(0,0,0);font-family:verdana,geneva,lucida,&quot;lucida grande&quot;,ar=
ial,helvetica,sans-serif"><a href=3D"http://www.mnautox.com/" style=3D"colo=
r:rgb(0,24,57);font-family:verdana,geneva,lucida,&quot;lucida grande&quot;,=
arial,helvetica,sans-serif" target=3D"_blank">www.mnautox.com<br></a></span=
><br></div></div></div></div></div></div></div>
</div>

--00000000000083526706438955d7--

--===============5564238101645068463==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

--===============5564238101645068463==--

---

From: DAVID MASSEY <[email-masked]>
Date: Fri, 14 Nov 2025 12:42:29 +0000 (UTC)

------=_Part_8109136_530415142.1763124149130
	boundary="----=_Part_8109135_655507534.1763124149018"

------=_Part_8109135_655507534.1763124149018
Content-Transfer-Encoding: quoted-printable

It all depends on the level of charge.=C2=A0 A fully charged battery will f=
reeze at about -70 deg F but a fully discharged battery will freeze at 32 d=
eg F.=C2=A0 At 50% charge it will freeze at about -15 deg F.=C2=A0 An AGM b=
attery is a bit lower.=C2=A0 Below is a curve from USBattery.com

Since you live in an area that can expect sub-zero (F) temperatures at some=
 point over the winter leaving it out with a state of charge less than 60% =
is risky.
Dave=20

=20

    On Friday, November 14, 2025 at 02:39:12 AM CST, Philip Ethier <pethier=
[email-masked]> wrote:  =20

=20

OOPS.=C2=A0Absorbent glass mat

If you leave a vehicle outside all winter in a cold climate without chargin=
g the AGM batteries, will they be ruined=C2=A0by the cold?
I know that regular lead-acid batteries can freeze up, but I don't know abo=
ut AGM batteries.

--=20
Phil Ethier, West Side, Saint Paul Minnesota, USA2006 Gulf Stream Conquest =
Super C, 8.1, white2011 Cayman 2.9 PDK, white2021 Ford F-150 3500cc twin tu=
rbo, white1991 Caterham 1700 Super Sprint, not white
www.mnautox.com

--=20
Phil Ethier, West Side, Saint Paul Minnesota, USA2006 Gulf Stream Conquest =
Super C, 8.1, white2011 Cayman 2.9 PDK, white2021 Ford F-150 3500cc twin tu=
rbo, white1991 Caterham 1700 Super Sprint, not white
www.mnautox.com

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/arch=
ive

[email-masked]

 =20
------=_Part_8109135_655507534.1763124149018
Content-Transfer-Encoding: quoted-printable

<html><head></head><body><div class=3D"ydp6a9917dayahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div><div dir=
=3D"ltr" data-setdir=3D"false">It all depends on the level of charge.&nbsp;=
 A fully charged battery will freeze at about -70 deg F but a fully dischar=
ged battery will freeze at 32 deg F.&nbsp; At 50% charge it will freeze at =
about -15 deg F.&nbsp; An AGM battery is a bit lower.&nbsp; Below is a curv=
e from USBattery.com</div><div dir=3D"ltr" data-setdir=3D"false"><br></div>=
<div dir=3D"ltr" data-setdir=3D"false"><img title=3D"Inline image" alt=3D"I=
nline image" src=3D"cid:[email-masked]" cla=
ss=3D"yahoo-inline-image" draggable=3D"false" style=3D"max-width: 555px; wi=
dth: 100%;" data-id=3D"&lt;[email-masked]&g=
t;"><br><span></span><br></div><div dir=3D"ltr" data-setdir=3D"false">Since=
 you live in an area that can expect sub-zero (F) temperatures at some poin=
t over the winter leaving it out with a state of charge less than 60% is ri=
sky.</div><div><br></div><div class=3D"ydp6a9917dasignature"><div style=3D"=
color: black; font-style: normal; font-size-adjust: none; font-weight: norm=
al; font-stretch: normal; font-size: 12pt; line-height: normal; font-family=
: Arial, Helvetica, sans-serif;"><div style=3D"color: black; font-style: no=
rmal; font-size-adjust: none; font-weight: normal; font-stretch: normal; fo=
nt-size: 12pt; line-height: normal; font-family: Arial, Helvetica, sans-ser=
if;"><div><font size=3D"4">Dave <br></font></div><div><span style=3D"font-s=
ize:10.0pt;font-family:sans-serif;color:black;"><br></span></div><br></div>=
</div></div></div>
        <div><br></div><div><br></div>
       =20
        </div><div id=3D"ydp504f502yahoo_quoted_3864829564" class=3D"ydp504=
f502yahoo_quoted"><div class=3D"ydp504f502yahoo-style-wrap" style=3D"font-f=
amily:Arial, Helvetica, sans-serif;font-size:16px;">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div class=3D"ydp504f502quoted-text-header">
                        On Friday, November 14, 2025 at 02:39:12 AM CST, Ph=
ilip Ethier &lt;[email-masked]&gt; wrote:
                    </div>
                </div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"ydp504f502inline_repl=
y_quote_container" data-split-quote-node=3D"true">
                <div><br></div><div><br></div>
                <div><div id=3D"ydp504f502yiv7157825480"><div dir=3D"ltr"><=
div dir=3D"ltr"><div dir=3D"ltr"><div style=3D"font-family:monospace;" clas=
s=3D"ydp504f502yiv7157825480gmail_default"><br></div></div><br><div class=
=3D"ydp504f502yiv7157825480gmail_quote"><div dir=3D"ltr" class=3D"ydp504f50=
2yiv7157825480gmail_attr">On Fri, Nov 14, 2025 at 1:34=E2=80=AFAM Philip Et=
hier &lt;<a href=3D"mailto:[email-masked]" rel=3D"nofollow" target=3D"_=
blank">[email-masked]</a>&gt; wrote:<br></div><blockquote style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x;" class=3D"ydp504f502yiv7157825480gmail_quote"><div dir=3D"ltr"><div><div=
 style=3D"font-family:monospace;">Absorbed Gas Mat batteries:</div></div></=
div></blockquote><div><br></div><div style=3D"font-family:monospace;" class=
=3D"ydp504f502yiv7157825480gmail_default">OOPS.&nbsp;<span style=3D"color:i=
nherit;font-size:inherit;font-style:inherit;font-weight:inherit;font-family=
:Georgia, Times, Serif serif;">Absorbent glass mat</span></div><blockquote =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex;" class=3D"ydp504f502yiv7157825480gmail_quote"><div dir=3D"l=
tr"><div><div style=3D"font-family:monospace;"><br></div><div style=3D"font=
-family:monospace;">If you leave a vehicle outside all winter in a cold cli=
mate without charging the AGM batteries, will they be ruined&nbsp;by the co=
ld?</div><div style=3D"font-family:monospace;"><br></div><div style=3D"font=
-family:monospace;">I know that regular lead-acid batteries can freeze up, =
but I don't know about AGM batteries.</div><br clear=3D"all"></div><div><br=
></div><span class=3D"ydp504f502yiv7157825480gmail_signature_prefix">-- </s=
pan><br><div dir=3D"ltr" class=3D"ydp504f502yiv7157825480gmail_signature"><=
div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div><sp=
an style=3D"color:rgb(0,0,0);font-size:12.8px;background-color:rgb(255,255,=
255);"><font face=3D"monospace" style=3D"background-color: inherit;">Phil E=
thier, West Side, Saint Paul Minnesota, USA</font></span></div><div><span s=
tyle=3D"font-family:monospace;color:rgb(0,0,0);">2006 Gulf Stream Conquest =
Super C, 8.1, white</span></div><div><span style=3D"color:rgb(0,0,0);backgr=
ound-color:rgb(255,255,255);"><font face=3D"monospace" style=3D"background-=
color: inherit;">2011 Cayman 2.9 PDK, white</font></span></div><div><span s=
tyle=3D"color:rgb(0,0,0);background-color:rgb(255,255,255);"><font face=3D"=
monospace" style=3D"background-color: inherit;">2021 Ford F-150 3500cc twin=
 turbo, white</font></span></div><div><span style=3D"background-color:rgb(2=
55,255,255);"><font face=3D"monospace" style=3D"background-color: inherit;"=
>1991 Caterham 1700 Super Sprint, not white</font><br style=3D"color:rgb(0,=
0,0);font-family:verdana, geneva, lucida, arial, helvetica, sans-serif;"><a=
 href=3D"http://www.mnautox.com/" style=3D"color:rgb(0,24,57);font-family:v=
erdana, geneva, lucida, arial, helvetica, sans-serif;" rel=3D"nofollow" tar=
get=3D"_blank">www.mnautox.com<br></a></span><br></div></div></div></div></=
div></div></div>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"ydp504f502yiv7157825480gmail_signature_prefix">-- </span><br><div dir=
=3D"ltr" class=3D"ydp504f502yiv7157825480gmail_signature"><div dir=3D"ltr">=
<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div><span style=3D"colo=
r:rgb(0,0,0);font-size:12.8px;background-color:rgb(255,255,255);"><font fac=
e=3D"monospace" style=3D"background-color: inherit;">Phil Ethier, West Side=
, Saint Paul Minnesota, USA</font></span></div><div><span style=3D"font-fam=
ily:monospace;color:rgb(0,0,0);">2006 Gulf Stream Conquest Super C, 8.1, wh=
ite</span></div><div><span style=3D"color:rgb(0,0,0);background-color:rgb(2=
55,255,255);"><font face=3D"monospace" style=3D"background-color: inherit;"=
>2011 Cayman 2.9 PDK, white</font></span></div><div><span style=3D"color:rg=
b(0,0,0);background-color:rgb(255,255,255);"><font face=3D"monospace" style=
=3D"background-color: inherit;">2021 Ford F-150 3500cc twin turbo, white</f=
ont></span></div><div><span style=3D"background-color:rgb(255,255,255);"><f=
ont face=3D"monospace" style=3D"background-color: inherit;">1991 Caterham 1=
700 Super Sprint, not white</font><br style=3D"color:rgb(0,0,0);font-family=
:verdana, geneva, lucida, arial, helvetica, sans-serif;"><a href=3D"http://=
www.mnautox.com/" style=3D"color:rgb(0,24,57);font-family:verdana, geneva, =
lucida, arial, helvetica, sans-serif;" rel=3D"nofollow" target=3D"_blank">w=
ww.mnautox.com<br></a></span><br></div></div></div></div></div></div></div>
</div>
</div>_______________________________________________<br><br><a href=3D"mai=
lto:[email-masked]" rel=3D"nofollow" target=3D"_blank">Shop-talk@=
autox.team.net</a><br>Donate: <a href=3D"http://www.team.net/donate.html" r=
el=3D"nofollow" target=3D"_blank">http://www.team.net/donate.html</a><br>Su=
ggested annual donation&nbsp; $12.96<br>Archive: <a href=3D"http://www.team=
.net/pipermail/shop-talk" rel=3D"nofollow" target=3D"_blank">http://www.tea=
m.net/pipermail/shop-talk</a> <a href=3D"http://autox.team.net/archive" rel=
=3D"nofollow" target=3D"_blank">http://autox.team.net/archive</a><br><br>Un=
subscribe/Manage: <a href=3D"http://autox.team.net/mailman/options/shop-tal=
k/[email-masked]" rel=3D"nofollow" target=3D"_blank">http://autox.team.=
net/mailman/options/shop-talk/[email-masked]</a><br><br></div>
            </div>
        </div></div></body></html>
------=_Part_8109135_655507534.1763124149018--

------=_Part_8109136_530415142.1763124149130
Content-Transfer-Encoding: base64
Content-Disposition: inline; filename="1763124010023blob.jpg"
Content-ID: <[email-masked]>

------=_Part_8109136_530415142.1763124149130
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

[email-masked]

------=_Part_8109136_530415142.1763124149130--