my esc is the quark125 monster.idk if it has the low volt cut off?is that important though?so u can do fast charge if i dont want to wait 2 hours for charging 2 batts?

i saw some 2s2p 5000mah 7.4v,can i use those too or just stay with 2s1p?

i would stick with the 1p turnigy packs. 2p packs tend to go out of balance a little easier.

if i were you i'd just get a 3s and a 2s "15c" pack. yes, they can be wired in series as long as they are the same mah rating and they are both equally charged.

that's only $50 for both batteries and less than $40 for the charger. it doesn't get ANY cheaper than that, and you will still have higher quality than those expensive maxamps packs.