I have recently read and personally experimented (dead battery) that when lead-acid batteries are stored in an uncharged state (<50%) for an extended period, lead-sulfur deposits form and harden on the lead plates inside the battery.
This is bad because it causes what is known as a "sulfated battery", which will no longer charge to its original capacity.
I have also read that there are "regenerators" devices that send pulses of electric current through the battery, which in some cases may cause the sulfate to flake off the plates and eventually dissolve.
My question is: does it also happen if your lead battery is stored attached to a "charge keeper" circuit hence the charged state is always >= 75%?
And if you have to design your own "battery charger" to charge a Lead Acid Battery, do you also have to include a "Pulse Regenerator" circuit?
Is there a complete and clear paper on this? width a bit of theory and practical schematics?
thanks