2S4000LPJR : 7.4v 4000mAh rechargeable Li-PO receiver battery for RC models. Dimensions: 2 3/4" across, 2" tall, 3/4" thick (68mm x 52mm x 19mm.). Weighs 5.3 ounces (150gms). Replaces SPMB4000LP etc. Includes Balance charging connector, EC3 connector, and JR male connector (plugs into receiver). Suitable for use with SPEkTRUM, JR, HiTEC, Futaba, Airtronics Z receiver systems, and more. Re-charges with smart Li-PO charging systems (YT-0006, B3AC, UP100AC etc.). Use with a Voltage Regulator for receiver applications.