I will use 2 DC motors (4-6v, 250mha) + 1 servo (6v) with Arduino uno + driver shield.

I don't know which battery I can use. Some tell me 12v others tell me 9v. Can anyone tell me which voltage and amp would be suitable?

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  • I kind of depends on your shield and servo consumption for the Amps. As for the voltage if you use 12V or 9V you need a step-down board to provide the 6V of your motors, arduino uno likes to be powered around 7-12V according to documentation – N. Staub Sep 13 at 7:14

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