This is the Hobbico LiFe 6.6V 1900mAh 2 Cell Battery Pack. FEATURES: Fits the Futaba 4PK, 6J, and 14SG transmitters May also be used as a receiver battery (6J will require HSP82469) LiFe (lithium iron phosphate LiFePO4) offers a lightweight, high energy density battery with more power than NiCd and NiMH receiver batteries provide Nominal voltage rating of only 6.6V typically does not require a regulator to power receiver and servos Universal Receiver Plug with 22AWG 5.1" (130mm) long wire INCLUDES: Hobbico LiFe 6.6V 1900mAh Receiver Battery Pack with one Charge Lead w/ElectriFly Balance Connector and one Discharge Lead REQUIRES: Charger such as the Hobbico LiFeSource AC/DC Balancing Charger (HCAM6375) (only use chargers that specifically say they are compatible with LiFe cells) SPECS: Capacity: 1900mAh Number of Cells in Series: 2 Rated Voltage: 6.6V Continuous Discharge Rate: 3C (5.7A) Maximum Recommended Charge Current: 1C (1.9A) Charge Lead: 24 AWG, 1.2" (30mm) long wire w/ElectriFly Balance Connector Discharge Connector: 22AWG, 5.1" (130mm) long wire w/Universal connector Dimensions: 3.3 x 1.7 x 0.55" (83 x 44 x 14mm) Weight: 3.7oz (106g) including wires jxs 08/17/10 ir/jxs update JAW 8/9/12 updt jxs 02/18/13