4000mAh 7.4V 2S Smart LiPo Receiver Pack (SPMX40002SRX)

Spektrum Smart LiPo Receiver Battery, 4000mAh, 7.4V (2S), 15C, with IC3 or IC5 output connectors, is a high-capacity power pack designed to reliably power RC receivers and lightweight on-board electronics. Built with Spektrum Smart technology, it communicates with compatible Smart chargers to automatically load charge preferences and monitor battery health, so charging becomes as easy as pressing Start. The IC3 and IC5 connector options provide secure connections and broad compatibility with modern Spektrum gear as well as older EC3/EC5 setups.

Smart features go beyond raw power: an integrated microchip stores data such as battery brand, chemistry, capacity, C rating, per-cell voltages and temperature, plus a log of charging cycles and abnormal events. When paired with a Spektrum Smart charger, the battery can automatically discharge to a safe storage voltage after a chosen idle period, helping extend life and preserve performance. A standard servo discharge lead is included for convenience, and the lightweight 2S pack is well suited to powering receivers in planes, cars, boats, and other RC models that rely on dependable, easy-to-manage power.