When using a tester to measure a battery, it indicates plus and minus in reverse. Why?
The reason could be that the discharge balance was lost during the last discharge period. or, when new and used batteries are mixed in the same appliance. As a result, the phenomenon of polarity reversal occurred.
When more than two batteries are connected in series and used until the last moment of discharge, polarity reversal can occur.
When a large capacity of electric current exceeds the limit and leaves the battery, a minor difference in battery capacity can cause a significant decrease in electric balance, reversing the batteries' polarity.
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