RAVPower Lightning Cable Apple MFi Certified 3ft 0.9m Lightning to USB Cable for iPhone 6S 6 Plus 6 5S 5C 5 iPad Air Mini iPad 4th gen iPod Touch 5th gen and iPod Nano 7th gen (Blue);

Never run out of power as you always have a backup. You can keep one at home, school, or the office, while the other powers a second device.