That website has some good information and some not so good information. I have yet to find any single site that covers all items of interest. Most are just too dumbed down.
For example:
"The charging voltages are the same as for any standard battery - no need for any special adjustments or problems with incompatible chargers or charge controls. And, since the internal resistance is extremely low, there is almost no heating of the battery even under heavy charge and discharge currents. The Concorde (and most AGM) batteries have no charge or discharge current limits."
I have heard anectdotally that AGM's CAN be charged with traditional chargers...without damage....yet the charge profile, that is the pattern of charge voltages, is not the same on chargers equipped to handle both wet cell lead acid and AGM's....such chargers do have different settings. There is most likely a reason. See below.
Regarding the low internal resistance of AGM's: This IS a significant benefit for those who repeatedly and deeply discharge batteries, say for refrigeration power. What it means is that only a few percent of the charging power, maybe 1% to 3% is reportedly lost to internal battery heating losses; in traditional wet cell lead acid that is more like 15% or 20%....
Even more importantly, AGM's can be safely charged at their rated amp hours!!!.....so an 8D battery rated, for example, at about 225 amp hours CAN be charged at that rate (225 amps) if AGM; for wet cell lead acid, any charging is limited to about 20% or maybe 25% of that rate....say 50 amps...in other words, an AGM can be charged four to five times faster than traditional wet cell lead acid batteries!!!
If you have a generator running most of the time for, say air conditioning, that might not be of much interest since you have plenty of time to charge batteries; but if you run your generator for limited periods, say for evening cooking and heating domestic hot water, that rapid charging can be a real advantage in minimizing generator run time.
Of course AGM's ARE a LOT more expensive to buy, but also offer the lowest life cycle cost per amp hour delivered.....that is, you pay more up front but you get even more relative output over the life of the battery.
(I previously posted about this here some years ago...but the website that had charts plotting such performance is no longer available.)
