How to complete a circuit with an empty battery slot in a toy car?

Circuitrocks 1 2 3 4 Slot Battery Case For Battery Box AAA

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slot studio This four-slot charger measures battery capacity, voltage, internal resistance, and charge time It can charge AA, AAA, AAAA, and C batteries,

ubgaming slot slot in separated electrically - insulated parts , for the purpose described battery , said slot being in separated electrically