I'm currently doing a project involving two MG996R Servos supplied by four AA batteries supplying 6V each (so one set of four batteries per a single serv). For this project I need to know how long these batteries can supply power to these servos before they run out. For this I need to know how much power these use in their zero position as well as while moving, but I don't really have an idea how to do this since I can't find these statistics anywhere.
I'd really appreciate it if someone could help me out here, and sorry if this is a bit of a stupid question.
The power a servo uses depends on the load on it, so what it's connected to. That's the same whether the servo is moving or for example it is just holding something stationary against gravity or perhaps pushing against something.
it's not really possible to calculate. And even the capacity of batteries is not that easy to determine. If you are using rechargeable batteries (recommended) the best bet is simply to run the whole system normally for a known time and then recharge the batteries and see how much it takes to get them back to full.