Common Sense RC Lectron Pro 6.6V 2000mAh 5C LiFe Receiver Hump Pack with Servo C

6.6V indicates you will not require a regulator!
This 6.6V (2-cell) 2000mAh 5C LiFe (lithium iron phosphate, LiFePO4) receiver battery offers a terrific combination of performance and benefit. Our LiFe batteries have some special benefits over other battery alternatives that make them ideal for use in radio systems:

Voltage stays above 5V throughout your entire run, so you get more consistent servo speed and torque than with NiMH batteries

A little lower voltage than Lipos indicates you can securely connect 6.6V (2-cell) LiFe batteries to your receiver without requiring a voltage regulator
Our 2000mAh capability beats the 1300-1800mAh you'll find in standard flat and hump packs from the majority of other providers

Specifications
Connector: JR (Universal) Servo Connector

Measurements:
Length: 56mm (2.20 in.)
Width: 32mm (1.26 in.)
Height: 28mm (1.10 in.)
Weight: 91g (3.21 oz)