When i used to work for Verizon Wireless as a tech, we regularly serviced huge glass lead-acid batteries that had a rated lifespan of 95 years. Not saying they didn't need charged, and they were not practical for anything except sitting in banks to provide stable DC voltage, but before I'd seen those, I had no idea batteries could last that long. Funny thing: the cost to setup all the acid-catchers and safety equipment exceeded the cost of the batteries by about 60%, and it was still cheaper than AGM or other batteries due to the long depreciation schedule and their ability to provide a TON of current capacity.
These were only used in the switch, big AGM batteries were used at the sites for transportation reasons (you really don't want to carry 1000 lb. glass jars up a logging road to the top of a mountain..