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 a fantastic mix of efficiency and benefit. Our LiFe batteries have some special benefits over other battery options 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 safely link 6.6V (2-cell) LiFe batteries to your receiver without needing a voltage regulator
Our 2000mAh capability beats the 1300-1800mAh you'll discover in standard flat and hump packs from many other suppliers

Specifications
Port: JR (Universal) Servo Port

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