[squeeforever]

HOLD ON GUYS.... Newuser, first off, the only difference in the 9920 and the 12020 is how many amps it is capable of delievering to the motor. A 9920 is PLENTY for a 10XL. No need to get a 12020. Also, I would recommend either 5S LiPo or 6S LiPo. 6S is about like 20 cells and 5S is about like 16. I'm running a 10XL as well and going with 6S LiPo. It just depends on how fast you want to go. Now, as for batteries. Get 2 packs and not one because it balances out the weight evenly. Chaos, one reason not to get the 5S3P is because thats 15 cells! a 5S2P 8000mah would be better and only 10 cells. Stampy has it right as well. Series only doubles the voltage. Parallel doubles mah and amp draw but not voltage. I would run series because usually parallel will be more expensive. Newuser, go with 2 3S2P packs or 1 3S2P pack and 1 2S2P pack in series for 5S2P. Understand? Lastly, the 9920 can handle ANY mah as well. No worries about that.