another source for agm batteries

Any truth to AGM's REQUIRING high charge rates to survive?

There are some Universal's here that work out to $1.76 per amp-hour http://www.batterystuff.com/batteries/rv/#a8830

Very strange charging spec. It's more like a lead acid battery.

Recommended charge rate: 0.1C
Max charge rate: 0.25C

The Deltran AGM info gives charging at 0.4C. That's more like it for an AGM battery. Fast charging is one of the main attributes for AGM.


SLR100-8 Specs:
VOLTS 12V
AMP HOURS 100AH
WEIGHT 68LB
SIZE : L=12.1" W=6.7" H=8.2"
MAX. CHARGING CURRENT: 25A
MAX. CHARGING VOLTAGE: 14.7V
RECOMMENDED: 10A, 14.5V

There is no need for an 'impression' that AGMs do not require the higher volts that seem to be the belief by wet owners.

Facts are that 14.7V exceeds the charging specs for my Deka. 14.7V is not low, but is at the higher end of the range for charging volts.

Didn't we recently have a post about charging AGMs with a dumb 13.8V converter/charger for 7yrs? Start reading here.

HTH;
John

Hi,

One of the pages I referenced mentions charging at 14.7. I'm as always, researching before I make the leap.

mena661 wrote:
PT might be under the impression that AGMs charge at lower volts.

PT might be under the impression that AGMs charge at lower volts.

BFL13 wrote:
Deltran has this take on AGM charging--see adaption 4-step (vice usual 3-step) in this and note the voltages. You do need to click to enlarge

http://batterytender.com/resources/battery-basics.htm/#answer6

None of the AGM mfgrs mentioned anything about temperature compensation? I thought that was at least a common should-be. I find 14.9 and 15.6V unbelievable as common regular charging volts across AGM mfgrs. Educate me!

Is that link an example of Marketing wibbly-wobbly?

P.S., What is the reason for the 14.7V mentioned earlier in this topic?

HTH;
John

Deltran has this take on AGM charging--see adaption 4-step (vice usual 3-step) in this and note the voltages. You do need to click to enlarge

http://batterytender.com/resources/battery-basics.htm/#answer6

Deltran has this take on AGM charging--see adaption 4 in this and note the voltages.

http://batterytender.com/resources/battery-basics.htm/#answer6

MEXICOWANDERER wrote:
If the plate is 99.999% Pb and the electrolyte is 1.300 an AGM is an AGM.

"Hey Harry! We can't make it seem like we are a 'me too' battery! Round up all the specs from everyone else, and change ours to make 'em different. No! not the weight and plate count dummy! They can check that! I mean stuff like amp hours and charging voltage. What the hell is 5 amp hours, and a tenth of a volt or so?"

Don't laugh, This is what goes on in sales department meetings.

Yes. For some enterprises, marketing is all about making sales by telling lies that the engineers can tolerate and that can get past the Law dept. :)

I do believe it is reasonable to digest AGM specs and look for commonality and discard outlier specs. That is why I am asking about 14.7V if it wasn't clear beforehand.

Doesn't an AGM mfgr hurt sales by quoting lower charging Volts? If I had a 14.6V Boondocker charger I would have second thoughts about switching to AGMs.

What is the reason for the 14.7V?

HTH;
John

If the plate is 99.999% Pb and the electrolyte is 1.300 an AGM is an AGM.

"Hey Harry! We can't make it seem like we are a 'me too' battery! Round up all the specs from everyone else, and change ours to make 'em different. No! not the weight and plate count dummy! They can check that! I mean stuff like amp hours and charging voltage. What the hell is 5 amp hours, and a tenth of a volt or so?"

Don't laugh, This is what goes on in sales department meetings.