I am currently looking at purchasing an early Prius Plugin- 2014/2015. It will come with a 3 year warranty and a low mileage.
There are several to choose from.

Can anyone advise me how long I may expect out of the lithium batteries in these? Are there checks one can ask to view on these batteries? And have Toyota had to replace any yet?

I guess the hybrid battery has the same life as that in the standard Prius?