Interestingly they don't tell you anything (unless I missed it) about the battery for the non-plugin hybrids, eg. the Corolla Cross: https://www.toyota.com/corollacross/features/mpg_other_price...

I was looking up this year's Corolla a while ago and likewise there was minimal info that I could see about the battery capacity, which I think I figured out was about 3kWh.