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If you do accidentally leave them in the cold, DO NOT PLUG THEM IN RIGHT AWAY! Bring them inside, and let them warm up for several hours. The cold will cause condensation to build up inside the machines and the instant heat from powering them up will cause damage to the battery and the electronics of the device. Water and electricity don't mix.
If something does happen to your device, please let the help desk (x5102 or email@example.com) know right away, along with what happened so we can best assess how to fix the device.