07 Prius battery charge????????

So it was probably 110 today(AZ weather is death). I sat in park for maybe 15 mins with AC and my battery was at I believe 3 or 4 bars. I turned my car and AC off and ate and then on my way home my battery showed it got down to one bar. I've had the car for around a year and I've only seen the battery actually get down to one bar once before. At that point I turned my AC down to minimum. As I was going home (maybe my paranoia was kicking in) but I noticed after coming off of red lights or stop signs, the car seemed it was putting in a little extra work to accelerate. (Sorry best way I can explain it) I got home maybe 10 mins later. I turned the car off. At around 15 mins after that, I turned it back on to check and it was still one bar. So I ve decided to just leave it off for the night. I know it s normal for a Prius battery to fluxuate but I just kinda have a bad feeling based on the accelerating issue. Does this seem normal?