08 Prius 148000 Miles Issue with Startup

Okay so let my start by saying what happened. I was doing uber and everything was alright with my car. The Oil change light was on but I know I don't need an oil change. So I went and got gas at the gas station and when I went back in my car to start it, I heard my phone vibrate but then everything went completely Dead. Everything. I thought it was battery and was just sitting in my car when the car just started up. I really didn't do anything. The next morning, it didn't start right away but I got it too and it ran fine for a few more hours. I also didn't notice anything wrong. I drove to my job on Monday and no problem. Then went in the car today and nothing. The check light (the bad one I think) came on.

Okay, a couple other things the key fob only worked when you put in the slot and couldn't lock it through the fob. Also, I checked the cap on the gas, heard that might be something but it clicked and couldn't come off. I haven't jumped it in a year or two. I think I have given all the information. Could this be just a blown fuse or issue with the 12 V. Again it was running perfectly fine. Thanks for any help and if you need any other information please ask. Also does this sound like a problem with the power invertor. I think thats what it is called.