BQ79616-Q1: When the number of batteries is less than 16, what is the difference between VC,CB floating and VC,CBconnecting to VAT?

When the number of batteries is less than 16, the datasheet gives  two kinds of circuits. What is the difference between VC,CB floating and VC,CBconnecting to VAT?

Star Xu：

您好，非常抱歉，官网没有查到完成的数据手册，没有查到相关信息。