Similar to the link below, I am doing a almost identical project. I know some user suggested a power brick but I prefer something more portable. I am looking to use seeeduino instead which has a 3.3 V limitation but the servo shouldn't affect the microcontroller. I plan to have 2 separate power supply, a lithium power around 3.3 power the seeed. While I think a 4x AA battery pack should be sufficient to power the servo? Would my assumption be correct?
Those servo at 6V draw probably 250mA each, so you are looking at 1.25A drawn from your 4AA pack. Can it provide that and for how long is the question you need to ask yourself (depends on your AA)
Probably not, unless you use high current NiMH batteries. The start/stall current of the SG-90 is 0.7 to 0.8 Amperes, so plan on 5-6V at 4A for 5 servos, minimum.
If you try to get away with significantly less current, you will probably end up with a twitching mass of servos.
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Or any one servo can move, but only one at a time.
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