The difference between starting and deep discharge batteries

MEXICOWANDERER wrote:

Be cautious with YOUBOOB training videos these guys have no oversight, no responsibility and sometimes no common or uncommon, sense.

Bill Hammack is not just some talking head on YouTube ! He is a professor at University of Illinois with a Phd !

I don't link "junk videos" from people without credentials

BFL13,

I think "starved acid" means there is more "plate" material than "acid". I.E. the electrolyte "runs out" while there is still "active material" on the plate, but the ph has become quite low.

I wonder if I will live long enough to have a solid state battery. In theory those could be used at low temperatures because there is no way for dendrites to form. If I understand correctly that is the problem with current LI jars. The lower temperature requires a higher charging voltage which encourages dendrites. But I may be "full of beans" on that surmise.

my server backup batteries i put in the Safari
102# each, 135ampHrs at the 8hr discharge rate
that 0.75# of lead per amphr

they were designed for an 8hr backup duty cycle in case of power failure, provide the sufficient number of batteries in the back to match the 8hr amp rate
which i think is 19amps
i don't remember the 20hr rate or the 100hr rate , but somewhere i have a PDF file with the numbers

anyway those are in the safari not in the bounder

in here i recently install an 8A4D 160# 200ampHrs
thats 0.80# of lead per ampHr

where (2) 6v GC weigh approx 124# and have 220 ampHrs
which comes to 0.56# of lead per Amphr

A mat can hold just so much electrolyte. If the mat is made thicker it will hold more electrolyte. Couple that with thicker plates and you have your 12-15 year low performance telecom battery. Acid density is the same.

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And here we have our group 31 AGM battery with genuine Telecom construction
76 pounds of pure energy
475 cold cranking amperes
75 amp hours capacity.

Yeah right. How many months until Chapter 13?

When a telecom battery's strong points are exploited
And weak points are addressed correctly
They are right up there on top of the heap.

Hydrogen sulfide is no joke.
From OSHA....Fifty percent of people exposed to hydrogen sulfide for just five minutes at 800 ppm will not survive, and a single breath at 1000 ppm causes immediate death.
People and animals have died at the beach from decomposing Seaweed and algae.

My confusion is between " acid starved" and "surplus acid". "Low SG" flooded is better for floating than high SG which is better for deep cycling.

So--- howinheck can "surplus acid" AGM be the same as "low SG" flooded for "telecom" batts?

BF13,

Telecom jars are a "surplus" acid design. That puts them sorta kinda closer to a flooded battery than other AGMs, except there is no way to add electrolyte. It limits the charge current to c/5 or about what a flooded jar can tolerate without gassing.

SO2 = rotten egg smell.

mike-s yup the OP does mention SO2 and made some unjustified assumptions. Mex did not know the video makes no mention of the gas. I think it is a good video for a beginner.

Someone is rattling off on things that will leave chemists rolling around on the floor clutching their sides in agony. Where is the towel for flowing tears?

Standard automotive AGM batteries contain less quantity of 1.300 specific gravity acid than telephone standby batteries. Telephone batteries are designed to last 12-15 years but offer specifically limited performance. Telephone batteries have thicker mats containing a greater quantity of H2SO4. The greater distance between plates is what causes higher impedance reflected in performance numbers.

BUT

What has been omitted from this board's discussion threads is the performance number in the 100 hour drawdown

The difference between a true cyclable battery has so many differences from a starting battery I am not going to even try to list them.

The point to fear from a damaged overheating overcharged battery in a confined space is H2S. Hydrogen Sulfide. The first thing is does is paralyze olfactory nerves almost instantly. No more rotten egg smell. H2S is poison to be respected.

Never forget that a badly boiling battery not only emits hydrogen, but two atoms of oxygen for every one of hydrogen. This is why batteries can explode. The evolution empties chambers and one spark is kah- blooey.

Other point. AGM batteries do NOT LOSE WATER. Purge all thoughts of this myth.
Recombinant SEALED VENT CAPS return hydrogen and oxygen as water to the mats. A venting AGM gets hotter than a popcorn fart before it vents. Close to 17 volts at 70F.

Now I can return to UBOOB and continue to search for the big enchilada -- how to turn Pb into Au