Spektrum 6S Smart 50C LiPo Battery with IC5 Connector. 
 
Features:
Spektrum Smart Technology Makes Charging and Maintaining Batteries Easy
Integrated Microchip Stores Unique Parameters for Each Battery
IC5 Connectors are Compatible with EC5
Save Time and Hassle, while Improving Battery Life
Smart Discharge Allows Batteries to Automatically Discharge to a Safe Voltage
Specifications:
Battery Capacity: 4000-4999mAh
Battery Type: LiPo (3.7V per cell)
Battery Voltage: 22.8V
Capacity: 4000mAh
Connector Type: IC5

CHARGING NOTE: When charging LiPo batteries, always use a compatible charger specifically designed for LiPo batteries. Follow all manufacturer instructions and safety guidelines to prevent overcharging, overheating, or any potential safety hazards. Always charge LiPo batteries in a fireproof charging bag or container and never leave them unattended during the charging process.