4s 5000mAH vs 5s 5000mAH runtime??

[shizzon]

I have heard that running higher voltage will increase runtime (depending on gearing and the motor of course). So will i see both increases in speed/power and runtime by going to 5s 5000mAH? Setup is E-revo with MMM/Teckno Neu 1515/1y and current batteries are polyquest 30c 5000mAH 2s hardcases, and how much runtime will i gain if any?

Thanks