Novak,
The data flash is divided up into 32 byte blocks called subclasses. So, you have to point to the subclass and read the block of data. The subclass values can be found in Table C-246 of the bq3060 TRM. You read or write the data in 32 byte blocks called pages. SMB CMD 0x78 is used to read or write the first page in the subclass, SMB CMD 0x79 is used to read or write the second page in the subclass, and so forth, as described on page 87 of the TRM.
Regards
Tom