BQ77915: Battery balance

Part Number:BQ77915

Hi team,

We have some questions for the BQ77915 in below.

1. The BQ77915 can do battery balance for the  BQ24773?

And the battery learn function must to do?

2. In the datasheet, the BQ77915 looks need to with 3-cell or more cell battery?

Is it can be used for 2-cell battery?

Thank you!