I'll add my bit about "pulse charging". Years back, when working at a golf course where many batteries were maintained, both in equipment and in golf carts, we became the target for a company selling a discrete pulse charging device. This gentlemen was from Canada and professed to be a patent holder of this device. He had paper work of white papers describing the device and it's effects on different batteries and uses. He had studies of fleet maintained batteries in different use settings and the effect of his device on the longevity of these batteries. It all looked very good and the statements regarding an increase in longevity of 33% over other batteries not using the device was a serious lure to bite on purchasing his devices for maintenance.
At that time, the cart maintenance had been addressed and a new multi-battery power supply had been installed at many thousands of $$$. The clubhouse people had finally figured out that 16 yr old kids (cart boys) did not have the best interest of the Golf Club in mind.
The rest of our running gear was maintained throughout the year by staff that meticulously repaired and maintained the equipment. Batteries were tested prior to their lay-over in Winter and the short period of non-use had little effect on those batteries.
Hence, we did not purchase the pulse chargers. I often thought about the claims of these gentlemen and I came to the conclusion that the overall 33% longevity claim was caused by the constant power floating the batteries and not from some spike in milliamps and low voltage.
Mex has done the research and others I've had contact with regarding "pulse charging" agree, it does nothing for battery longevity but since it is paired with battery charging, the end user has benefit.
Pulsing the DC input probably has no ill effect except for possibly interrupting the constant charge, as some pulse chargers do. A pulse charger that boosts milliamperage in parallel with the constant power, will have little effect, IMO, on sulfation or battery health.
Edit: I agree with landyacht 100%. If a user has a battery of suspected capacity loss feed the sucker with a lot of juice. An AGM with bad symptoms can be treated alike, feed it the juice.
