I had a little drone I got for Christmas a few years ago and flew it a little bit. The battery didn't last for anything. I actually just tossed it out a few weeks ago. There is a learning curve for flying a drone if you've never done it before. You may spend anywhere from a few days to weeks practicing with one to learn how to fly them safely without hitting other people or things.
I don't know which model you have but you may very well find a video on youtube of someone taking out the battery or performing maintenance.