I need some help choosing a lipo... and some set up..

Hi everyone i am going to be getting lipo battery soon and i wanted to know if this is any good ProTek R/C LiPo Pack (5s1p, 18.5v, 4000mah, 20C, orNeu Energy LiPo Pack (4s1p, 14.8v, 5000mah, 25C, how much run time can I get in a kyosho mp7.5 with a novak BL kit and the HV 4.5... I know the esc can only do 14.8 volts and the Pro Tek battery has 18.5 so that is a nother question can i run a bec so i can use 18.5 volts..

So if i can use the pro tek with the novak motor and esc then that is what i will get... But if i can not then i will the get the Nue Energy and a MMM when they get the problem fixted.. And a Feigao motor not sure which one so it would be greatly appreciated if i could get some help...

So if i go with the nue energy and a Feigao motor and a RC monster motor mount, a RC monster batter tray, A mmm or maybe a mm and a bec. Does this set up sound good.. I will be on a extremely tight budget because i will be racing a mp777 this summer yes it is nitro but i am going to start going to big tracks and races so that is what i have to run so that i can run a 30 minute main or more...

So i think i have found what i want tell me what you all think....

ProTek R/C 5S Li-Poly 20C Battery Pack (18.5V/4000mAh) 82.99*2 165.98

Hyperion EOS 0610i Net Li/NiMH/A123 Balancing Charger (6S/10A/250W) 169.99

Castle Creations Mamba Monster ESC. 169.95

Feigao 540XL - 10XL Brushless Motor (10trn, 5mm shaft, 66A, 1668kv)
[540840-10XL] $69.95 i think this is the right one if i am wrong pls tell me...

RC-Monster Brushless Motor Heatsink/Clamp (Feigao XL size, silver, CNC aluminum) 33.95

RC-Monster Battery Tray (Flight Power/Poly Quest, 5000 size, plastic, black)
[RCM-BTTY-TRY] $39.95

RC-Monster Electric Motor Mount (CNC aluminum, Kyosho 44.95

5mm bore, mod1 pinion 12.00 not sure which one to get.

[JThiessen]

Not that it will make a whole lot of difference, but your 4.5 can handle 16.8V.

Originally Posted by JThiessen

Not that it will make a whole lot of difference, but your 4.5 can handle 16.8V.

i do not have a 4.5 i want one but i do not want to fri the esc....do you know anyone that has run 18.5 volts on that esc...