How did the battery posts switch on my atv?

When i got the battery, the positive post was positive and the negative post was negative. Now, when i connect the charger, it just sparks like i have the positive and negative backwards. The charger is new and works as it should on other batteries. This battery, on my 1994 honda 300ex, now has a positive post that is negative and a negative post that is positive and works as it should. What's up with that?

Hey Bob… The larger diameter post or the one with the + is always positive! Someone was clueless and pretty frikin dumb!

Remove the battery and test it with a voltmeter

I knew no one would believe it, i'm not frikin dumb. I know the difference between + and - and they are backwards. Once they were not backwards and now they are. THEY WORK AS THEY SHOULD! But backwards. Tech, einstein, rocket scientist, it doesn't matter if you don't know the answer, then shut your mouth. I didn't ask for an insult.

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