SPMX40002SRX 7.4V 4000mAh 2S 15C Smart LiPo Receiver Battery: Universal Receiver, IC3 SLIPPER CLUTCH You won't have to worry

You won't have to worry whether your voltage and amperage are set correctly

Spur made from steel for added durability

- High reliability and High safety

auxiliary fan

High EfficiencyHobbywing's temperature control technology has been designed to protect the motor from being damaged by heat thus less heat more efficient the motor will run and perform

SPMX40002SRX 7.4V 4000mAh 2S 15C Smart LiPo Receiver Battery: Universal Receiver, IC3 SLIPPER CLUTCH You won't have to worrySpektrum 7. 4V 4000mAh 2S Smart LiPo Receiver Battery Features Spektrum Smart Technology Makes Charging and Maintaining Batteries Easy Integrated Microchip Stores Unique Parameters for Each Battery IC3 and IC5 Connectors are Compatible with EC3 and EC5 Save Time and Hassle, while Improving Battery Life Smart Discharge Allows Batteries to Automatically Discharge to a Safe Voltage Includes standard servo connector discharge lead for added convenience