The only way to tell for certain is to charge them up and put a load tester on them.
If they are bad, I would save a couple for trades on a new battery to reduce the risk of a core charge. They won't care what you give them, as long as it has a positive and a negative terminal and is larger than Duracell.
In fact, I'd take one of your batteries right now to save the core charge as I buy a battery for my battery-less Montgomery Wards 14.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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