Want to save the Die Hard? Here's how. If you want to be all greenie about it, dump the electrolyte in something and dispose of it properly......however that is. Or you can just dump it out in the dirt.
Then, rinse it out with a garden hose and a strong nozzle. Wear eye protection. Rinse it until it stops puking out crap and the water is CLEAN. Then drain it of all the water. Now, go to your local O'Reilly (see how I worked that plug in?) and buy some fresh battery acid. It comes in a six quart container and it's CHEAP. Refill the battery and slow charge it overnight. It will likely last another ten years. My best friend has one Daddy bought new in about 1974 "or so". I did the above procedure to it when I got it from Daddy in 1982 "or so". Then I emptied it out and gave it to my best friend about 1995 "or so". It was still good. .
