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Put a meter across the terminals the red is positive the black neutral if you get a positive voltage you have them the right way round if not you'll get a negative voltage.
check the voltage of the batteries before charging. Place on the charger and wait 1/2 hour or so, then recheck voltage. If it has not gone up, your charger is at fault.
You could try another battery if you have on(they only last for so many charges) or your charger could be bad. Try plugging it in to another outlet. Good Luck
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