I think this battery is toast

I forgot about that detail, MountaineerTom. As I said, I have the Northstar version of that battery. If I am correctly remembering (I may be confusing my LJ and Expedition because I put new batteries in both in the last year or so), I had the same problem, and it was because the width of the battery was a little short, so that wedge that you replaced bottomed out on the lip of the battery before the battery was tight between the wedge and the opposite edge of the battery tray. I think I ended up placing a small piece of aluminum sheet metal on one side of the wedge so that it didn't bottom on the battery. The rubber sheet idea is a good idea, too!
 
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I forgot about that detail, MountaineerTom. As I said, I have the Northstar version of that battery. If I am correctly remembering (I may be confusing my LJ and Expedition because I put new batteries in both in the last year or so), I had the same problem, and it was because the width of the battery was a little short, so that wedge that you replaced bottomed out on the lip of the battery before the battery was tight between the wedge and the opposite edge of the battery tray. I think I ended up placing a small piece of aluminum sheet metal on one side of the wedge so that it didn't bottom on the battery. The rubber sheet idea is a good idea, too!

That's what it felt like. The clamp was tight (I think that's how I cracked it) but it would still rock around a little.
 
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That's what it felt like. The clamp was tight (I think that's how I cracked it) but it would still rock around a little.
If you have lead connectors you can easily fix them to be tight again around the battery posts. Shave a layer of lead off on both sides of the gap as shown below which will allow the clamps to be tight around the battery posts again. What happens is the battery post and/or the inner round spot of the connectors wear to cause them to no longer fit tightly around the battery posts.
Battery connector.webp