Most of the inductive flyback pulsers require the use of a 1 amp trickle charger that is not automatic, not float.
I found the best trickle charger to use is the Shumacher MC-1 Battery Trickle Charger. You can get them cheaply at Ebay doing a search for
"MC-1"
Some folks disregard this advice and continue to use chargers that have too high of a charging voltage/current. This normally results in cell overheating which leads to permanent damage.
But, I have noticed that even when using a 1 amp trickle charger some batteries can overheat (10 to 20 DegF over ambient air temps).
I was testing out a new Mini-CIP design and wanted to kick the rate switch into High.
As a test I was using some severely sulfated 7AH AGM batts that have been ignored on the test bench for a couple of years. It occurred to me that perhaps
water cooling would keep them from overheating when using the more powerful CIP pulser.
I put the battery in a stainless steel container and added ice and water to fill up to within ½ inch of the top of the battery. This kept the battery top
dry and the battery cool. The use of a stainless steel container was important as the steel surface dissapates heat after the ice melts.
Naturally, we will get a bunch of folks that ignore this gem and use an insulating plastic container. 
It worked like a charm! Even after the ice melted, all the batteries cycled through the process did not gain more than 5 DegF over ambient.
The recovery was not hindered by using the ice. Capacity increase steadily plodded on if the batts were 40 DegF or 75 DegF.
At one point, I allowed the water level to cover the tops. Imagine my surprise when I discovered that many of these old AGM were leaking gas through the
pressure relief valve.
No wonder those puppies dehydrate!
Even with the tops of the batteries submerged it did not lead to any appreciable leakage of current or pulse via the conductive water path.
At any rate, by submerging AGM battery types, you can at least find out if they have leaky pressure relief valves.
In summation, water cooling batteries being pulse conditioned is beneficial. It prevents the cells of severely sulfated batts from overheating and further
capacity loss through permanent damage.
Water cooling may also allow the use of more powerful pulsers on severely sulfated batts to speed up the conditioning cycle without causing further damage.
The thought occured to me that rehydrating AGM might be simplified by heating the battery up (leaving out in the sun?), then submerging them in ice water.
I'll have to try that on the next batch of AGMs and see if that eliminates the leakage through the pressure relief valves.
