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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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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