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#4608804 - 12/19/17 09:10 PM AGM Batteries 12.8 or 12.9v instead of 12.7 ??
LoneRanger Offline


Registered: 07/02/07
Posts: 3926
Loc: Midwest USA
"The sealed AGM and gel cell battery voltage (fully charged) will be slightly higher in the 12.8 to 12.9 range"
https://www.batterystuff.com/kb/articles/battery-articles/battery-basics.html#3


I thought there was no diff between flooded wet cells and absorbed glass mat (AGM) on parked engine and parasitics off, charge shown on the multimeter.
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#4608819 - 12/19/17 09:21 PM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
bbhero Online   content


Registered: 03/20/15
Posts: 4364
Loc: Virginia
Nah the AGM batteries will having a higher open voltage than a comparable flooded battery being both are truly 100% state of charge.



Edited by bbhero (12/19/17 09:22 PM)
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#4608822 - 12/19/17 09:22 PM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
Colt45ws Offline


Registered: 08/15/06
Posts: 9612
Loc: Central Washington
Yes, this is true, they have a higher OCV. They also prefer a higher charging voltage.
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#4608957 - 12/20/17 05:07 AM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1630
Loc: Saskatchewan, Canada
A fully charged lead-acid battery will show 2.2V per cell (6.6V on a "6 Volt" battery and 13.2V on a "12 Volt" battery).

The 12.7~9 V/AGM reading they refer to in the OP's article is after a load has drained part of the charge.
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#4608995 - 12/20/17 06:07 AM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
LoneRanger Offline


Registered: 07/02/07
Posts: 3926
Loc: Midwest USA
Wouldn't 13.2v be the initial surface charge which bleeds off few minutes after removing a charger/maintainer, and the AGM battery then settles at 12.9?
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#4609179 - 12/20/17 09:50 AM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
maverickfhs Offline


Registered: 12/28/16
Posts: 1761
Loc: VA
Usually I have seen AGM stays between 12.75-13V. My current Yuasa AGM, stays at 13V even after a few days tender is removed, measuring from cheap HF multimeter though.

While lead acid ones I have seen between 12.4-12.6 after it has been fully charged, and tender is removed. These voltage varies based on the age of battery too.

All for motorcycles.
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#4609187 - 12/20/17 09:57 AM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
SHOZ Offline


Registered: 06/28/03
Posts: 5601
Loc: Illinois
The specific gravity of the electrolyte is higher in AGMs than a flooded battery. That is most of the gain in voltage.

Usually in the 1.315 range when finished and fully charged.
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#4609233 - 12/20/17 11:05 AM Re: AGM Batteries 12.8 or 12.9v instead of 12.7 ?? [Re: LoneRanger]
PiperOne Offline


Registered: 10/25/17
Posts: 163
Loc: A Highway Near You
The AGM banks in our trucks when properly charged settle out at 12.8 to 12.9. We basically charge at 14.7 and float at 13.8 on the charger, alternators temp compensate and will run between 13.5 and 14.9.
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