Need a battery for my truck

I need some help with a battery pack. My truck is almost ready, I just need a battery pack
I thought of a NiMH battery or a Lipo battery pack
Here is some information and parts I'll be using with my truck:
Radio- Futaba 4pl with R2104GF receiver
Savox SC-0251 MG servo for steering
Traxxas 2075 servo for shifting
ESC- Tekin FXR
Motor- Tekin 45T

Here is specification of the ESC and of the motor
ESC-
Input Voltage: 4-9 Cells/2-3S Lipo
Motor Limit: 12 turn
On Resistance: 0.0012 ohms
BEC: 6V/3A
Motor-
Input Voltage: 3S LiPo or 10-cell NiMH battery

I understood that I can use 3S lipo, but what is the voltage?, It could be 7.2 or 11.4, they don't write about that.
The savox servo is 6.0 v only and the power requirement of receiver is 4.8 v or 6.0 v NiCd battery that means I can't use a battery pack with voltage not higher than 6.0 volt?

I need an advice lipo or NiMh battery, a connector if I need one, and a BEC if it necessary.

Thanks in advance
Denis

A 3s lipo's voltage is 11.1 volts. What car? I either missed it or you didn't post it.

it looks liike you are buiilding a crawler, im guessing. 3s would be good but idk if the system would get hot. I would get anywhere from a 2000mAh to a 4000mAh LiPo

Yeah, I didn't mentioned:), I build a Tamiya Hilux highlift

you can get a reiciever pack for the servo and reciever but you can get a 3s lipo for the truck but be carefull with it
you might have to monitor it while driving

buy a castle creations BEC for a servo if u r buying a powerful one. check out DJMedic2008 on youtube cause hes got gobbs of videos for that stuff. hes had numerous builds where hes done what you r doing.