6.5 years on a battery - new personal record!

My best friend from high school still has the Sears Die Hard Daddy bought new for his Falcon in the mid 70s. In the early 80s, Daddy got scared of it and bought another battery. I gave him the 3 buck core charge for the Die Hard. I took it and emptied it out and flushed it out and put new electrolyte in it and put it in a 69 Chevelle I had. I sold that car but kept the battery and put it in a 67 Chevelle. This was probably about 87 or 88. I ended up selling that car in 89, right before I married my first wife, but again, I kept the battery. I emptied it out again but didn't fill it back up. I gave it to my high school friend for a shop decoration. He still has it today and I am 100% certain if he wanted to he could refill it with electrolyte, charge it and go. It just will not die.