Life expectancy with Dr Prius app Dr

Hi there,
I just bought my 2018 Prius C this summer. It was a rebuild. It has just over 50,000 km on it.
I finally got around to getting the OBD2 adapter and running the Dr. Prius app. The life expectancy that came up was 74.48% ... This didn't seem particularly high considering its a relatively new car with not that high mileage. I think it might have done a lot of sitting around before I bought it. Should I be concerned? If I drive it regularly now, will the battery capacity stay relatively high for a number of years still?
Any idea when I should expect the battery life to run its course if this is where I'm starting and I drive it regularly?
Thanks for your expertise!