Hello! First, 13 individual cells are connected in series to form a battery string, but the specific number of strings required for a parallel connection is related to the capacity of the individual cells.
Assuming the single battery is 2000 mAh, each battery string is still 2000 mAh. If a 10A battery is required, the number of batteries that must be connected in parallel is: 10/2 = 5 strings