The great Biden Battery shortage of 2021, another fantastic job! Glad to hear you got one without getting raped on the price. I load test my batteries every year and trend them so I can tell when they start to degrade. I've noticed that typical vented lead acid batteries give me about 4-6 years even if I keep the electrolyte SG and level in spec. The large delta in temperature between summer winter here is probably what kills them. That being said, my yellow top in the yota is still going strong from 2012!