4s 8000 lipo what brand?

[Finnster]

Mike has a 7800mah 30C or 35C batts in his store. Way better and cheaper than maxcraps.

But the above is true, its not going to give you much mroe runtime (assuming you are not hitting the LVC early due to zippy's poorly matched cells)

Plus, if you are using that 1600 kv motor, 4S is a bit slow for it, esp if you are using 6S now. 5S really seems to be the sweet spot IMO. A 5S 7800 batt would get you there, but its quite heavy. Perhaps think about two small batts and a batt swap? What are the rules you are running against? Do you have to "courtesy pit" if you are running against nitros? Maybe the race director will excuse those if you do a batt swap.