When I look at the cellpro, I have an option to buy with two GP/KO adapters or TP/PQ adapters. I thought I would probably try the Thunder power batteries or maybe the Rhino's.
Do I need either of these or maybe the better question is what do these two adapter plugs do?

And I've learned that I could build myself a serial harness and charge batteries individually or I could buy a 10s charger and wire my batteries together (in serial) and charge as one.

Thanks for the input. I'm slowly getting educated and looking forward to having another pattern plane to fly and getting back to some contests. My previous planes were YS powered and between dead sticks and dropping my plane in corn or bean fields I was getting tired of fixing minor landing repairs, vibration maintenance and figuring out the learning curve on a 4 stroke motor. I'm hoping the electric solves my dead stick challenges and keeps me out of the shop. My landing strip at my house is 70-80 yards long but I'm surrounded by fields on three sides. With the way these planes float, dead sticks can be challenging.