I am not familiar with these issues with wet batteries. However, I worked in the film industry for three decades and making sure that the batteries lasted and would carry a full charge was very important. Initially, the batteries were Nickel-Cadmium, but in the '90s I switched to the newer Lithium-Ion. Some issues that could damage the batteries, were allowing the batteries the drain below their threshold level, as well, overcharging would damage the batteries. In my case I had a smart charger that would ensure the battery was not over charged and would detect if there was excessive heat. Additionally, I fabricated a battery drain with cut out once the threshold limit was reached, then on the smart charger they went. The difference between the Ni-Cads and Li-ion and lead acid, is the latter don't have a memory as part of their function. With the former, if a battery is only partially drained and then recharged and this cycle is repeated, the battery can develop a "memory" of how much charge it will take. Mostly academic, but the point that I am making echoes what the staff from Shield Batteries is making. Letting the charge drop in any battery bellow the lower threshold, or over charging, will shorten the life. As smart charger will keep the battery properly charged.
Erich in Seattle
Erich in Seattle