Lots of lights

Hello all, I am new to the Prius world. I inherited my dads Prius when he had to go into the nursing home and recently passed. The car has about 250k miles on it and is doing rather well until today. I have put a new normal battery in it and a new hybrid battery in it back in November. Today when driving the battery indicator on the display screen was down to one bar. Normally it's full. I was able to get it up to just about halfway but it wasn't green. Driving home from work the red triangle of death came on and won't turn off. I shut the air off in hopes that would help. It's helped in the past. But so far no go. It makes a beeping sound when I go around a curve and before the red triangle would flash. Now it's saying problem and it's turning a light that looks like an oil can on. I just had an oil change done in March. And I know it's not the light that comes on for an oil change. It's also ticking when running. I haven't had the check engine light read yet. That will be a tomorrow thing. The tire light is always on and even though we have aired all the tires up it stays on. What concerns me is the battery indicator level (it's blue right now) and the red triangle of death. Another light that popped on for a hot minute was the circle inside the parentheses with the exclamation point in it. It wasn't on very long. The oomph that the car usually has doesn't seem to be there any more and the air wasn't as powerful as it usually is. To me that sounds like an alternator. But I am not sure. Whatever it is I hope its a cheap fix.