battery charging problem

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jackobian

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i have two battery full charged. but the amazing shocked problem when i connect them in series the polarity is reversed + becomes - and - becomes +. and when i check every one alone the polarity ok . i have not seen such a thing ever could you help me please.
 

Two batteries in series have the (-) terminal of one connected to the (+) terminal of the other. Then the unconnected (-) terminal is still negative and the unconnected (+) terminal is still positive but at double the voltage.
 

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