--===============7767371424824702439==
--0000000000008fad6405a2b559dd
Sounds like it may have partial bridging of the plates, causing a drain
internally. In the olden days, there were simple ways to check...I don't
know what you do now - take it to the FLAPS and let them put it on
the machine?
Jeff Scarbrough
Corrosion Acres, Ga.
On Tue, Apr 7, 2020 at 10:34 AM Jimmie Mayfield via Shop-talk <
shop-talk@autox.team.net> wrote:
> The recent discussion about solar-powered float chargers has reminded me
> of an issue that I've yet to understand or resolve...
>
> I have a Battery Minder 12248 (12V 2/4/8A) charger/de-sulfator with
> temperature compensation sensor. While I've never been able to
> appreciably restore a dead UPS battery using the de-sulfation mode, it
> seems to work fine as a slow charger. It has several modes -- gel-cell,
> AGM or flooded -- which, near as I can tell, adjusts the threshold
> voltage at which the charger switches from bulk-charge mode to
> float-charge/de-sulfation mode.
>
> Every 12V battery that I've ever connected to the charger, even the old
> AGM batteries taken out of my UPS units, eventually reached the
> threshold voltage and switched over to float mode (usually within 30-45
> minutes for a nearly-fully-charged battery). Except one.
>
> About 2 years ago I installed an Interstate battery from Costco (size
> 27F, 890CA, 710CCA) in my truck. It's a flooded battery and if I
> understand Interstate's spec correctly, its capacity works out to around
> 100Ah. The battery has a resting voltage of 12.6V so it doesn't appear
> to have any shorted cells and has no trouble starting my truck. So it
> seems to be a normally healthy battery, right?
>
> Thing is...I've never seen my charger go into float mode when connected
> to this battery even when it was nearly new. With the recent pandemic
> stay-at-home orders, yesterday I decided to connect my truck to the
> charger to stave off parasitic drain (measured to be 20-30mA) that may
> have accumulated over the past week of inactivity. I'm currently at 16
> hours (@4A) and it still seems to be in bulk-charging mode. I have
> difficulty believing that the battery needed 50+ Ah.
>
> So what's going on here? This is the only battery that I've come across
> that behaves like this.
>
>
> _______________________________________________
>
> Shop-talk@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.96
> Archive: http://www.team.net/pipermail/shop-talk
> http://autox.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/fishplate@gmail.com
>
>
--0000000000008fad6405a2b559dd
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Sounds like it may have partial bridging of the plates, ca=
using a drain internally.=C2=A0 In the olden days, there were simple ways t=
o check...I don't know what you do now - take it to the FLAPS and let t=
hem=C2=A0put it on the=C2=A0machine?<div><br></div><div>Jeff Scarbrough</di=
v><div>Corrosion Acres, Ga.</div></div><br><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"gmail_attr">On Tue, Apr 7, 2020 at 10:34 AM Jimmie May=
field via Shop-talk <<a href=3D"mailto:shop-talk@autox.team.net";>shop-ta=
lk@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote"=
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex">The recent discussion about solar-powered float chargers h=
as reminded me <br>
of an issue that I've yet to understand or resolve...<br>
<br>
I have a Battery Minder 12248 (12V 2/4/8A) charger/de-sulfator with <br>
temperature compensation sensor.=C2=A0 While I've never been able to <b=
r>
appreciably restore a dead UPS battery using the de-sulfation mode, it <br>
seems to work fine as a slow charger.=C2=A0 It has several modes -- gel-cel=
l, <br>
AGM or flooded -- which, near as I can tell, adjusts the threshold <br>
voltage at which the charger switches from bulk-charge mode to <br>
float-charge/de-sulfation mode.<br>
<br>
Every 12V battery that I've ever connected to the charger, even the old=
<br>
AGM batteries taken out of my UPS units, eventually reached the <br>
threshold voltage and switched over to float mode (usually within 30-45 <br=
>
minutes for a nearly-fully-charged battery).=C2=A0 Except one.<br>
<br>
About 2 years ago I installed an Interstate battery from Costco (size <br>
27F, 890CA, 710CCA) in my truck.=C2=A0 It's a flooded battery and if I =
<br>
understand Interstate's spec correctly, its capacity works out to aroun=
d <br>
100Ah.=C2=A0 The battery has a resting voltage of 12.6V so it doesn't a=
ppear <br>
to have any shorted cells and has no trouble starting my truck.=C2=A0 So it=
<br>
seems to be a normally healthy battery, right?<br>
<br>
Thing is...I've never seen my charger go into float mode when connected=
<br>
to this battery even when it was nearly new.=C2=A0 With the recent pandemic=
<br>
stay-at-home orders, yesterday I decided to connect my truck to the <br>
charger to stave off parasitic drain (measured to be 20-30mA) that may <br>
have accumulated over the past week of inactivity.=C2=A0 I'm currently =
at 16 <br>
hours (@4A) and it still seems to be in bulk-charging mode.=C2=A0 I have <b=
r>
difficulty believing that the battery needed 50+ Ah.<br>
<br>
So what's going on here?=C2=A0 This is the only battery that I've c=
ome across <br>
that behaves like this.<br>
<br>
<br>
_______________________________________________<br>
<br>
<a href=3D"mailto:Shop-talk@autox.team.net"; target=3D"_blank">Shop-talk@aut=
ox.team.net</a><br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk"; rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/shop-talk</a> <a href=
=3D"http://autox.team.net/archive"; rel=3D"noreferrer" target=3D"_blank">htt=
p://autox.team.net/archive</a><br>
<br>
alk/fishplate@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.=
team.net/mailman/options/shop-talk/fishplate@gmail.com</a><br>
<br>
</blockquote></div>
--0000000000008fad6405a2b559dd--
--===============7767371424824702439==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive
--===============7767371424824702439==--
|