In this case, polarity refers to the location of the terminals on the battery. Traditionally, it is named after the location of the “+” terminal when looking at the battery from the front side (or, in the case of side terminals, from the side closest to which they are located).
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+ on the left. With regard to passenger cars, such polarity in the CIS countries is often called “direct” or “ours”, because. the left location of the "plus" is typical for cars of the Soviet and Russian design. At the same time, in trucks (see "Destination") the situation is opposite — the left "plus" is the European standard.
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+ on the right. In passenger cars, the right “plus” is typical mainly for European models, for which this polarity in the CIS countries received the unofficial name “euro”, or “reverse” (as opposed to the east european “direct”). The opposite is true for truck batteries.
— + right / + left. This marking means that this battery model is available with both right and left "plus" (see above), and you can choose the option depending on the car model.
Note that the above division into “direct” and “reverse” polarity is not absolute, and anyway, before buying a battery, this parameter in your car should be clarified separately.
