2S5700JR: 7.4 volt 5700mAh rechargeable Li-PO battery pack, for R/C hobby receiver use. Includes male servo connector (choose from menua) and Balance Charge connector. Dimensions: 5.5" long x 1.75" tall x 0.68" thick; weighs 7.7 ounces (219gms). Re-charges at up to 1C charge rate; provides power at up to 10C discharge rate. Ideally suited for long-duration receiver usage. Has super-efficient capacity-to-mass ratio. A voltage regulator is recommended for use in conjunction with 7.4 volt Li-PO receiver batteries. These exclusive premium Li-PO battery packs are manufactured in the USA by BATTERIES AMERICA. Recommended charger: YT-0006S, B3AC, UP100AC, or other approved smart 2S Li-PO charger. If you prefer battery with FUTABA J male Rx connector, please choose Futaba J when ordering. Both versions will include the White Balance Charging connector. Can also be ordered with Red T Ultra connector, EC3 connector, or Tamiya connector.