7 Ah lead acid sealed battery advice please.

[DrJimFranklin]

the fact that a flooded cell battery has a higher charge rate than an AGM battery

Really ?
Both charge and discharge rates are higher with AGM. Put another way, if your charger can supply the current, you'll get your bulk charge in a hell of a lot quicker with an AGM than with most wet cell batteries. Note that "if" there - a lot of kit has "basic" charging and that'll leave you with questionable performance regardless of whether it's a "dry" or "wet" cell.

But it's pretty well irrelevant anyway - the equipment is designed for that size and type of cell. It's highly unlikely to have physical room for a wet cell of similar performance, and I doubt the OP will want to re-egineer (starting with a lot of reverse engineering) the charging system to maximise performance for wet cells.

Simon, the charge Voltage per cell is a lot higher for wet cell batteries than for AGM batteries..as a result they can be charged to full capacity a lot faster than AGM batteries..it's one of the few things that gives them the edge in certain applications.

 

[SimonH2]

Being pedantic, you are incorrect.
The chemistry is near enough identical, the chemistry of charging is the same, and charge voltages can be the same. The main chemistry difference is the addition of extra elements to promote recombination of the hydrogen and oxygen in a "dry" cell to reduce the inevitable loss of water.

Where they do differ in practical terms is that wet cells tolerate abuse (ie overcharging) because you can top up the water that's lost. If you have a good enough charger, you can charge them identically and the AGM battery will reach full charge quicker. But that "good enough charger" is quite complicated (although there are many single chip controllers these days) so most applications simply float charge them to avoid the complications.
And while you can force a wet cell to charge faster, initially, by pushing a higher voltage into it - unless it's one of the "lots of thin plates" designs (ie almost AGM but without the very low electrolyte quantity) then it quickly slows down charging - hence why a flat car battery doesn't fully charge in a few minutes after jump starting.

Even on a float charge, an AGM will charge "quite quickly".

What it really comes down to is this :
Because wet cells can be topped up, they tend to be charged by "less controlled" chargers that simply overcharge them in order to get them full faster - hence all the precautions against hydrogen build up where they are being charged.

But as I said, it's pretty irrelevant to the OP since he's unlikely to be in a position to change it.

 

[DrJimFranklin]

You do talk rubbish Simon. I suggest you learn about a subject before making assumptions.

 

[SimonH2]

In your opinion. I respectfully disagree with you. Lets leave it at that.

And as I said, it's irrelevant to the OPs problem since he is unlikely to have the option of changing battery type.