Check the wires that are soldered to the battery terminals and verify if they are connected properly, a poor solder joint is always possible and many times will pass a QC check, but become unconnected during shipment, rare but possible. You can also clean the battery terminals with a pencil eraser , it is mildly abrasive and will slough off any oxidation or tarnish that may have formed during shipment to you from overseas. I have had the motor terminals have this issue with new out of the box Z's and that caused the motor to work intermittently. Good luck , stay positive.
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