2015 Prius ICE kicks everytime when startup and slow acceleration

Hi everyone
I got a 2015 Prius, the time I bought it in 2019, there was nothing wrong until I set it aside for half of a year. The problems came, the first one, every time I started the car, the gasoline engine kicked in first, although it is half- charged like, over 50%, I already read some questions posted in this forum, and I believe it is NOT the problem of warm-up, because when I bought it in 2019, there is no such warm-up problem, the most scenario where the ICE kicks in the startup step is low battery. ice kicks in to charge to 50%, but mine is whatever the batter capacity is, always running for a while like a couple of minutes.



Another problem is the slow acceleration, especially on freeways, when I hit the pedal on the floor, the acceleration is still slow and takes longer to accelerate. Also, when the dash indicator bar is over the battery to the eco mode position, the engine starts again. It seems like the electric engine only works in EV mode at a very low speed which you drive like a snail. When I want to accelerate, it becomes fully on gas, instead of hybrid, the situation right now is that as long as I drive, even a 20 M/H, it is still fully on gas to push the car. And when going on an upside, even if I hit fully on the pedal, the engine rotates crazy, and the acceleration is still slow.

I believe we both know when accelerating, the car will respond quickly following your step, but mine is like you can feel the engine rotates fast, but can not respond following your step.


So the problems are FREQUENT GASOLINE ENGINE KICKS IN, SLOW ACCELERATION, POWERLESS UPSIDE.


I do not know if it is the problems of sensors, circuits, transmissions, or batteries. Can someone help me thank you so much. please.

I want to repeat, that it is NOT the warm-up problem.

 

Hi.
When I bought this car, there was no such issue, such as the ICE kicking in every time after turning the car on, you can try yours. mine is like everytime running for 3-5 minutes though the battery is not under 50%. Also when I drive on the road, I can feel there is no ECO mode where you feel a little of the engine sound, mine is either on battery pretty slow, you said 25 mph, but my car needs like 30 seconds to reach 25 mph with EV mode, or the Power mode, where is solely running on ICE. And my mpg is only 38. The car is 125,000 miles.

 

I do not think so. Mine is like 30 seconds to 65mph. what about yours? and the mpg is like 38. if I want to gain a quicker acceleration, every time, I need to release the pedal completely and then hit again. even I step on the floor the engine rotates very hard, the acceleration is still slow.