Hi, I am making a project and I use one Arduino Uno R3 and two Arduino Mega 2560. Because I have to buy the batteries I need to tge total current of them. I would be very thankful for an answer. :)
Since we do not know what the configuration is, it's mute what we think.
Just measure what current you are drawing with a DVM.
I you do not have a DVM get one.