Batteries for Dagu Rover 5 (4WD)

Hi all,

I am beginner, and I have a robot project with there devices:

 - Dagu Rover 5 (4WD) 

 - Dagu 4 Channel 5-12V, 2A Brushed DC Motor Controller

 - ARDUINO MEGA 2560

 - Batteries pack : 6 x 1,2v Nimh

Could i use only one batteries pack for all the robot ? Are there any precautions i need to take to be safe ?

ARDUNIO: input Voltage (recommended) 7-12V

Use a 5V regulated pin of the arduino for the Dagu motor controller for 5V logic 

And the 7,2 power directly connect to the Dagu motor controller for motors power supply

Thanks

Thank you for your answer.I

Thank you for your answer.

I think to use a batterie 7,2V 5000mA NiMh for RC cars. Its’s more easy for recharging.

Do you think that i can use a “relay” commanded by the arduino for switch on/off the motor Power ? it is usefull ?

If yes, what kind of relay you recommend to me ?

Regards