So I know this question has been asked quite a lot but I'm really conflicted with everything that I've read. As far as I know, servos require a surprisingly large amount of current, I am using a single 9V battery right now and I've read so far that it isn't powerful enough (I've tried using the 9V battery to power 2 servos, one of them works fine but the other usually lags or jitters). However, a single 9V battery is what the tutorial I followed used (unless I misunderstood something I'm quite new to all this). So now I'm thinking of getting a 4 AA battery holder to power the servos but I'm trying to make sure that I don't make the same mistake again. Anyone can help?
My project is a robotic arm that uses 4 SG90 servos in total.