It depends what connector the batteries have for the main discharge leads, Deans, EC3, or something else. Based on the link you supplied above I would guess Deans, but I'd need to know that for sure.
You'd need the items on the links I provide above.
This one (if they are Deans) for the main leads.
And this one for 3S JST balance connectors.
Just go down to where you add to cart and select 3S JST-XH from the drop down box and add them to your cart.