Battery: AGM vs. Flooded Cell

" The reason they were going to be used was their higher charge rate. It wasn't 5 times but it was closer to 2 times faster. "

I am hung up on what exactly it means to say "2 times faster"

If that means you can do a 50-90 in one hour instead of two hours, restoring the same number of AH, then how can you do that?

Using a higher charge rate is given as the way to do it. Up to a point you do get a faster re-charge by using more amps per AH size of battery bank. You do not halve the time by doubling the amps, as seen in my ugly graph. It is a diminishing returns thing. But you can do it faster up to a point as seen. (ugly graph shown below)

Also, except for Lifelines, many AGMs specify a high limit on charging rate such as my Starks which say 27 amps per 100AH. So that is no higher than what a Wet can take.

So using a higher charging rate than what a Wet can take only applies to Lifeline AGMs. And I have not seen where they are excempt from the way that higher charging rates means Bulk ends at a lower SOC. So if you did use a way high charging rate, most of the recharge would be in Absorption tapering amps AFAIK.

So you are not going to get twice as long in Bulk at the max amps of the charger to achieve your 2 times faster.

I would like to see, using a charging profile for each case, how the 2 times faster would happen, to compare with the graphs in my ugly graph set. BTW that set is about what I see charging my AGMs and Wets, roughly the same.

Look back to 2004 on this forum BFL13

Do you not see my advice about 5% antimony batteries needing 14.7 - 14.8 volts to charge.

That would be SIXTEEN YEARS rock solid inflexibility.

As far as speed is concerned the BRAND of the battery remains fully in the picture. I trust Lifeline to not LIE about their specs. For flooded I trust Rolls & Surrette to not LIE about their data. I do trust Trojan's advice regarding their industrial batteries.

To rely on ADVICE of someone whose opinion rests on incompetent information from some battery manufacturer's SALES AND ADVERTISING dept yields results appropriate derived by its components