I just checked the weight of the power poles compared to the Deans...
The weight of 2 45A pins plus 2 plastic housings for the anderson power poles, which would be the equivalent to a male or female Deans plug, is 3 g making it 6g per plug.
The Weight of a Complete Deans plug is 5g

To combine 2 5cell packs I would need 3 complete deans plugs for a total of 15g plus some wire to make a Y harness

I can use seperate the plugs on the packs and plug leads together and save the harness with the power poles making the total weight 9g for the power poles...

I think I am going to go with the power poles