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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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