In April 2018, Interstate Batteries of the Sierra’s based in Carson City, Nevada, brought in a battery they claimed was 26 years old. It came from a customer of theirs who turned it in for scrap. Of course, it was completely dead. In fact, it read -0.3 volts (slightly reversed). They were hoping we could revive it. We did.
Here is a video of the amazing recovery and subsequent testing. The battery has been returned to Interstate Batteries. Special thanks to Gary Krupp and Don Ornbaum of Interstate for giving us this challenge and their great support and products.