New Coach Batteries

It takes an intense amount of ignorance to harm an AGM battery. And the first correction is

14.4 volts static will not, cannot, won't and does not cause gassing. You know how I know this without question? instead of armchair dart throwing I actually created an environment with my own two hands with a genuine AGM battery not some abortion telephone morphidite but a real BCI battery in 100-degree weather, set the Borg on 14.4 volts and left it there for 5 days. Afterward the battery measured 104.4F

Let me count the ways...

• At 80F ambient, it takes voltage in excess of SEVENTEEN to Maybe crack the vents for a second or two to relieve pressure. Have you ever done this?
• Now tell me, is SEVENTEEN anywhere near fourteen point four volts?
• Is a hundred degree day anywhere close to rational for doing a reclamation on sn an AGM battery?
• Leave your dog or your children in a car overnight lately? How the hell can anyone start charging a battery and just walk away? Does the thought of a timer shutoff ring any bells out there?
• Have any of you baked a cake or roasted a turkey before. Temperature and Voltage are amplitudes and time is time? Well, lessee, three hours at 375F is the same as nine hours at 215 or seventeen minutes at 1,700F right?

Some of the answers border on the ludicrous. If you want to LEARN ask questions. Don't assume to create a qualitative or quantitive answer out of thin air. The reality in the form of hard facts jump up and will screw up even the best efforts of fiction. Like recombinant cell caps. Like pure virgin lead paste.

It is foolish to compare an automotive battery to a telecom battery. They exhibit different traits in different environments both chemical and electrical. To do so is like trying to compare a heavy-duty truck gasoline engine to a diesel.

A moderate overcharge will dry a flooded battery to dust. The same -percentage overcharge- will erode AGM plates without venting one molecule into the atmosphere. Are we on the same page here? Again and again, amplitude and time enter the picture here.

And for chrissakes, please get it clear that a battery charger is not the same as a converter. Apparently, some converters can be reprogrammed with a setting t become a constant voltage device. These critters are rare indeed and REGARDLESS only a fool would entertain the idea of time has no bearing on a constant voltage condition.

A stupid 14.4 volts with a stupider timer is all that is needed to bring an AGM battery to 14.4 volts. Sixty bucks for a Meanwell or Megawatt and a million cycle durable wind up timer. No complex voltage and time formulas like with a wet battery. But then when I read complaints on this forum that a person needs to rise off their dead *** a few times to discover WHEN a flooded battery starts to bubble and thereafter use the voltage and amperage displayed on their wall meter as a valid reference from then on I gave up. Suffer excessive battery problems but don't take personal malfeasance public and try to blame it on bad batteries.

And LY, this subject has as much to do about politics as margarine has to do with antifreeze. If an individual wants nothing to do with their batteries then suffer silently.

landyacht318 does your AGM behave in the same manner as BFl13's?

PT---"It is my understanding that 'normal' AGM cells are a "starved acid" design. So once all the electrolyte has been moved to the plates, charging more won't cause the battery to gas."

My AGMs get down to about 0.5a/100AH but if I don't get back to them till later, the amps will be higher and climbing. The batts feel hotter, confirmed by IR gun temps. Must yank the charger if that happens!

So now I always try to be there at the low amps stage so I can drop the voltage.

I don't know what "kind" of AGMs I have. The ones this happened with are same as these, but branded "Stark".

http://www.bestconverter.com/UB121000-100-AH-Deep-Cycle-_p_293.html#.XWm2vknsZpw

How soon before this thread too, devolves into politics?

5.4.3.2.1.....

pianotuna wrote:
Hi 2oldman,

A role in WKRP in Cincinnati. He was the advertising sales manager. One of his fund raising efforts involved throwing turkeys out of a plane. He genuinely thought turkeys could fly.

2oldman wrote:
Who is Herb Tarlek?

I’m afraid he’s now hold up with John Galt...Others soon to follow...

Hi BFL13,

It is my understanding that 'normal' AGM cells are a "starved acid" design. So once all the electrolyte has been moved to the plates, charging more won't cause the battery to gas.

Telcom jars are a surplus acid format--so best to not push the charging rate, or they may gas.

Of course, all lead acid formulas are subject to positive plate shedding. Once those plates erode there is permanent loss of capacity. In the case of flooded jars, the space beneath the plates may fill up and eventually may short them out. That is what happened to my Marine jars after nine years. One of the seven became a vampire. I was able to save the larger bank because of having a disconnect switch.

The other failure mode is dendrite growth. When they penetrate the plate separators, it is game over, and a catastrophic failure, with lots of heat and gassing.

Dendrites are a problem for LI batteries, too.

BFL13 wrote:
"The battery with the LEAST sensitivity is an AGM. They recharge until the electrics run into a stone wall then refuse to charge more."

The thing there is that if you keep the charger on, the AGM will not charge more, but instead the amps go back up and so does battery temperature.

With Wets, if you do that, all that happens is it gives off more fumes and you can replace the lost "water".

To me, that makes the AGMs more sensitive to recharging when you aren't right there when they get to "full".

Hi Mex,

I'm going to guess that the one exception is Lifeline. (other than Surrette)

Hi 2oldman,

A role in WKRP in Cincinnati. He was the advertising sales manager. One of his fund raising efforts involved throwing turkeys out of a plane. He genuinely thought turkeys could fly.

2oldman wrote:
Who is Herb Tarlek?

nvm

MEXICOWANDERER wrote:
I tried bringing some light to this on this forum for what? Sixteen years?

Clearer and more concise writing would help. Who is Herb Tarlek?