New to the forum, need help with red triangle of death

Hello there. I have a toyota prius 2006 and had it for 2 years now. It was bought used by my father, if that is important.
I've recently, and I mean as recent as about 8 hours before I made this post, come into contact with what's knwon as the red triangle of death on my dashboard. Not only that, but I've also got the vsc and the check engine light on as well. at first I was going to take it to our mechanic, but when I began to make my way there, I noticed that I had to press on the acceleration and brakes harder than I used to. I also checked the battery and realized that it was barely even a couple of bars. Since the mecahnic we go to was about 15 minutes away, I decided that going wouldn't be possible myself. I tried looking at youtube videos and readinng online articles about it. I'm still unsure of what problems my prius could be having that it would have these lights, hugh i have a bad feeling it has something to do with a dead battery cell, or even worse, the whole battery.
TLDR, Triangle of death, unsure of what to do, help.

 

Alright, so update on the situation. Good news is that I managed to actually take it to the auto shop. Bad news is the code that our mechanic got was the hybrid battery. Now I'm going to have to scour for a hybrid battery to replace it. He offered to at least reset the lights on the dashboard on the chance that it could just be an error, but I declined since if it's appearing on the obd reader then resetting the light wouldn't do anything.

 

where do i find a replacement module for 30 dollars?