I have been guilty of not thinking about this myself. Good lesson learned here.
Warning about "juice jacking."
Juice jacking happens when unsuspecting users plug their electronic devices into USB ports or use USB cables that have been loaded with malware.
The malware then infects the devices, giving hackers a way in. They can then read and export your data, including your passwords, and even lock up the gadgets, making them unusable.
To protect yourself, use your own safe cables (no "give-away" cables which might have malware), only plug into an electrical outlet, and use portable batteries from known vendors.