Acceleration sputter/lag

at that age and mileage, it might just be that the older battery doesn't have what it takes, and the engine is underpowered.
it's not the oil, but you should check the level frequently as routine maintenance.
if it starts happening more often, you might consider a throttle body and maf sensor cleaning, fuel injector in the gas tank, and a look at the spark plugs. do you know the maintenance history?

 

As above this is pretty normal If you're hybrid battery is the original which at 149,000 mi would not surprise me at all. What you have to think about is that battery in your '09 if original is now what 18 years old 16 something not that quick on the math so it's very old If you read about hybrid batteries and most all hybrid cars 6 to 10 years is your lifespan this is from people since they've started noticing and watching this stuff so you're 6 years past the maximum of that discussion so you've done real good and if you can keep from flooring it and demanding craziness from the car it may last longer I've seen one go 435,000 and still running. But this is a woman driven car on flat land that goes back and forth to a teaching job at a university everyday and the car isn't perfect condition almost not a scratch on it even with that ugly tan velor interior It's not showing any ugliness yet mine look like hell in 2 years It's very difficult to keep up with so your battery if it's original is definitely on its last leg even if the car is running great It's just very old It's been cycled a lot so bear that in mind when you get upset in the Prius it's not really worth flooring the car You're not going to really make a show of superiority or anything it's not like you're whopping down on a V8 with open headers or the proverbial Harley so just don't do it is your best bet. Or if this is a rebuilt battery that's even worse It's bought you some time I guess but it sounds like it's getting close to time for a battery when lights and Christmas trees show up on your dash that's past time It's not worth it to play whack-a-mole replacing modules and all this farting around because people charging you money to do that You could be putting that money toward a $1,600 battery and you and your son can put it in on the weekend.

 

The issue might be partly psychological. The Prius is a pretty gutless car and when your adrenaline level is up and you mash the accelerator you expect the car to go "zoom", but mostly it goes "yeah, I'll get back to you later on that speed you requested". After you have owned it longer your subconscious will stop expecting fast acceleration and you won't perceive the lack of it as a stumble.

That said, I have never stomped the accelerator on our Prius at a dead stop. Maybe it does stumble a bit under those conditions. What it won't do is spin the tires and take off like a bat out of hell, leaving rubber on the road and smoke in the air.

 

No but my '09 will squall the tires It is shocked me a few times actually I was actually quite surprised and actually I'm quite surprised by the acceleration that my '09 does have It's by no means a stoplight burner but I'm going to tell you what zipping through town and what have you I'm generally out in front of lots of people with way nicer cars and all that it's got nothing to do with it really but the car has very decent acceleration I was expecting a lot worse and the three others that I have here are pretty much on par with the '09 the '07 the '08 even the one right now with the bad brakes goes like stink better not need to stop quickly actually it stops pretty good.