I checked out our 2012 Prius 2 144v pack back in 2019 using:
https://www.amazon.com/Panlong-Bluet.../dp/B00PJPHEBO
With a Mr Prius app and got a good report. I guess it's time to do it again.
The car still works very well in EV mode. The last time we had good weather, I was using EV mode to assist the MPG coming home a few miles from babysitting "work", (5 days a week) and was averaging 60 to 70+ MPGs. Now that we use the heat & headlights, it's down to around 50-55 for the same ride..