Hii!

I need some help identify the following PCB, I tried to search the numbers as seen in pictures, but couldn't find any related information.
This PCB is used on a battery pack for an E-bike.
The information I need regarding the PCB if it can handle adding more battery's to the pack, without extending the amount of current this PCB chagrining controller can handle.

Currently the pack contains 3 x 7 (21 batterys) (Samsung ICR18650 26J 3,7V) that are connected in a series and parallel (7x3) for an output voltages of 24V and 7.8 Ah.

I was thinking of replacing these battery's and adding a total of 63 battery's of but keeping the same voltages of 24V, but that will increase the Ah (7x9).

Any help is appreciated

 

It should work without any modification. It will just take three times longer to charge the new pack.
Be very careful to charge each of the new cells to the same voltage as the ones in the pack before you connect them in parallel, otherwise you will get some very heavy currents flowing between them which could cause damage to you and the cells.