Gen 4 Prime (2020) not fully charging anymore

After all these years? WOW!!
Dr. P was what first popped into my head, but I used to use Engine Link, Car Scanner, or OBD Fusion. Not sure which. After downloading and installing the Toyota PID file. It's been too long ago and now I've forgotten the details.

 

Yeah, I know. What I did is ran battery recoding for a whole drive (about 20 minutes) and imported the CSV into Excel and graphed the cells' voltage, voltage difference between cells, min and max voltage of the cells during different scenarios (coasting, max Regen, Mac acceleration, etc) to get an idea of the battery health myself.

You can see that thread here

Dr Prius and the Gen4 Prime (bad news) | PriusChat

 

Maybe at high speeds, but I cycle my battery about 2.25 times a day 5 days a week for my 70 mile round trip commute. I now have ~80,000 miles on my 2020 prius prime and it is averaging about 5.8 KWh to charge to 100% from near empty on a charge point charger. However, the last 2 years it has varied without any obvious reason from as low as 5.3 KWh to as much as 6 KWh. It is never in extreme cold, but for several months a year it is parked in the sun 5 days a week with outside temp above 100 degrees F. It is almost never driven above 65 mph. It is usually only at 100% charge for 2 hours per day 5 days per week. Here is a screenshot of change in miles/KWh and KWhs to fully charge the battery over the last few years. I think fully charging it every day is absolutely fine as long as it is driven conservatively and you are okay with minor battery degradation.

 

Referring back to the original post… he says he’s measuring his kWh in the ChargePoint app. They clearly state that this is their “estimate” based on their data on whatever car model you entered into your user profile in the app, ie not actual.

 

The Op already admitted that his "hot-rodding" in EV mode caused this. He slowed down for a while and everything went back to normal. He even stated that the ICE was forced-ON on multiple occasions because he went above 85 mph in EV mode. If you don't think running your car in EV mode at 80+ mph doesn't do anything to your pack - put your hands on that rear seat panel. You can feel the heat radiating off that pack, even with the large air gap between the pack and that panel.
Secondly; if you hot-rod around in an ICE vehicle, doesn't your mpg go into the crapper. It's all just physics, power in - power out; with higher repair cost. The more stress you place on your equipment, the chances of it breaking goes up exponentially.
Whenever I finish merging onto a highway; I back-off the accelerator pedal and kick it over to HV mode. Not as fun to drive in Eco mode but I still average over 75 mpg traveling around 75-80 mph on the interstate. I kick it back over to EV mode when I exit the interstate.

PS, I also recharge daily and the only variations I've been seeing is weather related. KWh per mile goes down during the cold winter months but begins to increase in spring and peaking in the summer months - even with the higher use and demand of the heat pump.

 

I don't think the KWhs is an estimate based on the car you have on your charge point profile. I think you are referring to the miles added displayed in the Charge Point app.