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

6.6V suggests you will not need a regulator!
This 6.6V (2-cell) 2000mAh 5C LiFe (lithium iron phosphate, LiFePO4) receiver battery supplies a fantastic mix of performance and benefit. Our LiFe batteries have some unique benefits over other battery choices that make them ideal for usage in radio systems:

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

Slightly lower voltage than Lipos suggests 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 discover in basic flat and hump packs from many other suppliers

Requirements

Length: 82 mm
Width: 30 mm
Height: 16 mm
Weight: 83 g
Connector: JR (Universal) Servo Connector