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Are double A batteries dangerous?

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The letters indicate the size, in height and width, of the battery. For example, \u201cAA\u201d means \u201c50.5mm x 14.5mm.\u201d The letters originally began with A and progressed upward in size.Jul 28, 2011');})();(function(){window.jsl.dh('48','');})();(function(){window.jsl.dh('_Nq2fYNTyBKi00PEPveO2wAQ92','
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Each battery has two metal terminals. One is marked positive (+), the other negative (-). There are also positive and negative cables in the jumper cable set. The red one is positive (+), the black one is negative (-).

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