DECA AGM Batteries

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BFL13 wrote:
AFAIK, storage voltage spec 13.2v is at 77F so in colder temps you have to adjust that higher (is a table for that)

Sticking to 13.2v (for 77F) at 35F would be way under what 13.2 is supposed to do at 77F

OPs location states "south", I suspect experiences a lot less "colder" temperatures than what you would in Canada..

and depending just how deep "south" they are they can easily see temps above 60F all winter and experience temps well into the low 100F area in the Summer.

So, unless they have a temp compensated converter, 13.2V would most likely be far more appropriate for not only FLA but AGM..

But in reality, they could save one heck of a lot of money by reducing the float from 13.5V (which cooked their FLA) down to 13.2V and just buy another set of FLA at a massive savings over the AGM..

They won't save a penny on AGM if they cook those also..

down home wrote:
About to have the batteries changed out in the MH to AGM..finally. Last year where we had it stored didn't check the after and all the batteries went dry refilled and everything was good for a while but batteries were swelled and now 7.5 volts is all they hold.
All that CW carries is is the DECA Brand. They are supposed to fit the same dimensions as the T105s.
1500.00 for four.
Anyone have experience with DECA AGM deep cycle 6 volt batteries?

Had bad experience with Deka AGM 12V
Died soon after I bought from Cabela,
,I suspect it wasnt brand new but used,,got my money back so no harm done.

Must obey what the battery likes and ignore what the owner prefers.

AFAIK, storage voltage spec 13.2v is at 77F so in colder temps you have to adjust that higher (is a table for that)

Sticking to 13.2v (for 77F) at 35F would be way under what 13.2 is supposed to do at 77F

This is puzzling. I maintained 13.45 volts on a pair of 31 AGM lifelines for 9 years and one retains 97+ % capacity the second 94+% capacity. I have lots of trouble lifting their weight but when I moved in August neither had lost .03 oz I never detected .1 degree F Delta T in float nor >2°F max bulk @ 80+ I

Capacity testing requires nichrome ceramic windings to keep wattage discharge constant.

Not only do I use Moore thermocouples but adhesive thermal tattletales as well
Once they turn black the game is up.

I am due to capacity test the 31XT Next week. I have not grounds to disagree with the Concorde standard charging graphs which degrade with temp for compensation.

down home wrote:
Ours lasted 8 years+ One time as far as we know, is all it took. The batteries were dry. We paid for them to be as part of storage to be maintained.
I am concerned about over charging.Currently it is set to float charge at 13.5 volts. As to bulk charging it goes pretty high but I don't remember figures. I have hard getting the controller to do as I understand the manual.
I hope these Folks are familiar with it. If not, a trip to the factory, again.

13.5 float voltage will easily take out FLA by boiling them long term, that is what killed your current FLA.

For best FLA storage, that needs to drop to 13.2V!

According to Battery University, 13.5V-13.8V is supposedly compatible with AGM but with any type of battery that you cannot add water that WILL eventually kill them by either drying them out or eventually warping them. Both results are from overcharging.

Most UPS units are set at 13.8V-14.0V which dramatically shortens the life of AGMs in standby use (typically have to change UPS AGM batteries every 2-3yrs).

I personally use 13.2V for long term float of Gel and AGM batteries for my own designed device use. With that voltage I can easily get 10yrs out of AGMs and Gels.

Once it is fully charged and in storage, there is zero reason to keep hitting AGM, Gel or FLA with anything above 13.2V unless you are equalizing (and that is questionable on AGM or Gel).

Storage mode, you only need to give it enough voltage to "maintain" the full charge, in other words just enough charge to take care of the self discharge. Self discharge on AGMs is much less than FLA so they require far less charging..

I maintained a group 24 AGM at a constant 15.6 volts, 24/7 for three months in the antelope valley in 1992. At the end, it had not lost .3 oz of weight. The scale I used was assigned a registration number certificate with NIST. The popoff valves were intact. It was not a Chinese battery.

Out of (perhaps) ten batteries I tested for RAMCAR battery, the lowest voltage encountered that popped an overpressure vent was lower 17's.

So absurdly high that I have seen few legitimate AGM vented batteries. Warpage of plates is the usual suspect in AGM overcharging. And plate deformation is sure and certain death.

Anyoneone who cannot maintain the common sense to avoid mistreatment of posessions needs a room key not an RV key.

Ours lasted 8 years+ One time as far as we know, is all it took. The batteries were dry. We paid for them to be as part of storage to be maintained.
I am concerned about over charging.Currently it is set to float charge at 13.5 volts. As to bulk charging it goes pretty high but I don't remember figures. I have hard getting the controller to do as I understand the manual.
I hope these Folks are familiar with it. If not, a trip to the factory, again.

You can get a Deka group 31 AGM (labeled Duracell) at Sam’s Clubs east of the Mississippi for $179 each. If you are patient, they have a sale most years where you can get $20 off on each battery. 4 decent batteries for $640 plus tax is not bad.