Maybe an adapter like this UMX Beast parallel charge adapter
will work. There is also a cheaper version without the banana plugs for a couple of dollars cheaper on the RC-connector site,
You will need a way to connect the JST-XH balance tap of the above parallel harness to the Cellpro's balance port. I would imagine if you use other lipo's with the XH balance taps, that you would already have an adapter for it.
Edit. Oops. Already answered while I was typing.