If parallel the battery pack the purpose could be increase battery capacity only, and battery capacity voltage internal
Resistance should be very close.
If you want to increase battery current you CANNOT Parallel the battery pack.
What BT Communication Module can do? With BT Communication Module , the APP Software can be connected , and all information of the Battery pack can display on your Mobile Phone . and you can set some parameters on Your APP software :Over-charge protection voltage , Over-discharge protection voltage, Over Current Protection, Temperature protection and Battery capacity.