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

6.6V suggests you won't need a regulator!
This 6.6V (2-cell) 2000mAh 5C LiFe (lithium iron phosphate, LiFePO4) receiver battery supplies an excellent mix of performance and benefit. Our LiFe batteries have some unique advantages over other battery alternatives that make them perfect for usage in radio systems:

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

Somewhat lower voltage than Lipos suggests you can securely link 6.6V (2-cell) LiFe batteries to your receiver without requiring a voltage regulator
Our 2000mAh capacity beats the 1300-1800mAh you'll find in standard flat and hump packs from most other suppliers

Specifications
Port: JR (Universal) Servo Port

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