I can't understand why sparks weren't flying when you connected two batteries in parallel and one was reversed polarity. Newer smart chargers wouldn't work. Older manual chargers send sparks flying.
I have seen two 12v in series on trolling motors and electric wheelchairs reverse polarity. Reversing polarity occurs one battery is weaker than the other. Continued use causes the polarity of weaker battery to reverse polarity. When you recharge the 2 batteries in series, the weaker battery will end up with correct polarity. So it may be possible to charge with the correct polarity. Test battery afterwards. Post back
That's why it's a good idea to replace all batteries at once.
Your battery is always worth $10 at O'Reilly's. They will $10 in store credit.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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