When low on battery power, most restrooms on planes have an outlet.
110v two prong outlet originally intended for… you guessed it…an electric shaver. You can get a quick charge from this outlet on the plane when there aren’t any available . As with most models out there charging at your seat is still a bit rare. Use this restroom outlet to juice up your phone battery when low. Although to get the most out of it you will have to hold up in the restroom for a bit. Try turning your phone off (or at least put it in airplane mode!) for a slightly faster recharge.