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I was thinking about this battery pack, as I can get it from a local supplier, and adding a 5v limiter on it so I don't fry the servos.
Yes, switching power supplies are synonymous with "battery eliminator circuits". [...] switching power supplies are often marketed as BECs.
They're probably also the cheapest ones you can find, and are designed usually to handle one to six servos (up to around 5A total is common).
5 cells x 1.2v batteries will give me ~6 volts to work with when fresh, and ~4.5volts when considered flat.Will the 5 cells x 1.2v be sufficient?I'm assuming it won't be due to the voltage when flat only being 4.5v.Or should I still go with 8 cells (and thus more volts when flat) and use a buck converter?