4s2p lipos?

On a semi-related note. I want to verify that I can wire a 4x 2s1p packs to get 2 2s2p packs. I think I end up with the same number of cells, 8, but want to make sure I do it right.

Also, anything I need to know to solder LiPos? The only reason I ask is that I found some cheap Chinese packs on e-bay and they are 2s1p. They are only 10c but I will be running them in a Summit with a deWalt 14.4v motor.