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BatteriesI run 2 6s 4000 30c (in series) on my 700 rex.. it is set up for sport flying and no 3D at all for me.. more like the old pattern flier (that I am!!!), so loops, rolls, inverted, and big air maneuvers for me...and I am set at 7 1/2 minutes, but it will go 10 and still be under the 80% safety margin...
On the 600, you can use 3300's or the 4000's.. and you will be fine.. I would suggest that you go with 40c though, only because you are beginning 3D and you will be loading them a bit more then normal flying would...you will like the 600 on 12s.. no doubt.. they just seem to be so much "happier".. very little heat on anything if all is set correctly
Good Luck with your choice..
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft