You know? You are correct. I'm a telephone man by trade. Our central offices have generators for backup, but DC systems use huge wet cells with plenty of lead in the plates. But, a fairly new technology that has been around since the late 80's or early 90's, are manufactured by GNB (Great Northern Battery), now owned by Exide, and their "Absolyte" batteries. No lead other than connectors. Now, its been years, but I think they were called "lead antimony valve regulated" or something like that, where the batteries had some lead, but were wrapped in fiberglass, impregnated with some paste that held a charge, absorbing a small amount of electrolyte.
From memory, the best to worst batteries were wet cell (20 year proven), valve regulated (supposed 20 year), and gel filled (10 year lasting 2 or 3 years).
Batteries really are a science. I saw the aftermath of a fire caused by batteries packed in batteries, where one overheated, caused the ones touching it to overheat, the they all go into an oscillation of heat until...poof, exploded and ignited. I witnessed a near fire, same type of wrong install where jars were packed in jars and in jars, one overheated, spread throughout, but walked into the battery room when was smoldering warm, misty gas throughout the room, condensation dripping off of the ceiling, walls, everything. Those batteries (jars) were cooking off and on the verge of going into orbit. We got them stopped in time, but they were expensive scrap.
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