The need to work remote is becoming increasingly important and that's why you always need a replacement power adapter  to avoid disappointment.

This is why you need to keep a spare.

Replacement 5V AC-DC Adaptor Power Supply from Motorola -compatible for mobile devices operating at 5V DC & 2A   

Technical Specifications 

Overvoltage,

 High temperature, and

 Short-Circuit protection

100% Electrically and Mechanically Safe

Input Voltage: 100-240V 

Output Voltage: DC 5V

Output Current: 2A