Any external extension should always have dielectric grease added to the terminals to prevent corrosion and water ingress; especially if you leave it in for a while. I also recommend wrapping the connection tightly with tape to prevent it from coming loose and causing an electric shock. If you leave it outside in inclement weather, raise the connection point between the two cords or the end of the cord and the device and mount it more than 12 inches off the ground where it won't be swamped by heavy rain. and turn the drip loop or zipper down to prevent water from running down the line.
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