Hobbico LiFeSource 6.6V 1800mAh 10C R x U Connector FEATURES: LiFe (lithium iron phosphate LiFePO4) offers a lightweight, high energy density battery with more power than NiCd and NiMH receiver batteries INCLUDES: Hobbico LiFe 6.6V 1800mAh 10C Receiver Battery Pack with one Charge Lead and three Discharge Leads REQUIRES: Charger such as the Hobbico LiFeSource AC/DC Balancing Charger (HCAM6375) (only use chargers that specifically say they are compatible with