4000mAh LiPo Transmitter Battery (SPMB4000LPTX)

This 7.4V 4000mAh 2S LiPo transmitter battery is designed to power Spektrum transmitters, delivering reliable, long-running power for DX-series radios.

Compatible with the DX9 and DX9 Black Edition, DX8 Gen 1, DX7S, and DX20 as a stock replacement, it features a built-in cell balancer and a safety circuit that shuts the pack off to prevent overcharging and protect both the battery and the radio. The balancing system helps ensure the cells stay balanced for maximum pack life and consistent transmitter performance.