Gen 3 Buyers Guide (?)

I am helping a family member look at pre-owned Prius cars. I searched, but did not find something that was a clear "Buyers Guide" that seemed clear. So here are a few quick things I'm reading and would love to have added feedback.

1. Battery Warranty for NJ 10 years/150,000 miles (?)
2. Fluids replaced

Oil 10k interval
Brake fluid ?
Differential?
Transmission?​

3. If it has been sitting, this will affect battery charge?
4. What is anticipated costs of battery replacement?

If someone can share intervals for the fluids, it would be appreciated.
Anything I am missing or need to look at with pre-owned Prius?