need JST-XH 6s Y adapter

[BrianG]

As long as the respective cell in each pack is EXACTLY the same, you should be ok. The balance tap wires should be large enough to allow enough current (should be small) to equalize any difference between each parallel cell. Ideally, you'd have the parallel cells connected with a higher current wire, or just parallel the tabs on the cells directly.

As far as wiring, just parallel everything. How I would do it is:

1: Tie both main - wires together.

2: Hook a 0.1-0.5 ohm resistor between the two main + leads. This will equalize the whole pack together. Even though they may be balanced prior to hookup, there is still a chance of some difference. The resistor will limit any current while they equalize. Measure the voltage drop across this resistor; when you see 0v, they are equalized perfectly.

3: Remove the resistor and tie the main + wires together.

4: Put that resistor between the two balance wires of the first cell. Measure the voltage drop across this resistor; when you see 0v, they are equalized perfectly.

5: Remove the resistor and tie those balancer wires together permanently.

6: Repeat steps 4 and 5 for each balance wire.

Seems like a PITA, and may not be needed, but this how I'd do it to be perfectly safe...