PCA9685 Servo Driver icon PCA9685 Servo Driver Convert an EZB I2C bus into a 16-channel PCA9685 servo controller, exposing V0..V15 with hardware-timed PWM, external power and chainable boards. Try it →

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It really depends what you're going to hook up to the EZ-B. Have a read of this section if my power supply tutorial. There's also a detailed battery section as well. It should hopefully tell you everything you need to know. Bottom line is, if your connecting servos to the EZ-B, you will need a supply with a high amp output depending on what you have connected, and a voltage output between 4.5v and 16v.