This article describes using the charging cable for your terminal while on the move
Out of the box, your VX690 terminal comes with a car charging cable. The cable plugs into the back of the terminal just below the word 'VeriFone'.
We recommend leaving it charging any time the terminal is not in use, however, it is not essential.
WARNING: There is also a port on the side suitable for other USB cables, however, using this port for charging may damage the terminal. Please only use the provided charging cable.