Amps.... Any "Wall Wart" style power supply will not have the amps needed to handle the in-rush current of servos. NiMH (available as rechargeable AA), SLA and an LiPo batteries do, as do some very expensive bench power supplies.

See https://synthiam.com/Tutorials/UserTutorials/163/1 and https://synthiam.com/Tutorials/UserTutorials/170/1 for more details.

Alan

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Makes sense. I'll be building an independent static robot that will be on all day and need constant power. Do builders doing this typically power it from the EZ-B v4 base and just make sure they have enough amperage going in?

Yes, depending on what you are connecting to the EZ-B. With Servos, that is the way to do it. With motors and H-bridges, you will probably want an independent power line going to the motor controller and the EZ-B so you are not driving too much power through the EZ-B (depends again on voltage and amperage requirements though).

Alan

Great. Very helpful. Thanks.