Batteries are an important part of the DC systems in the substation

and regular discharge testing is essential to ensure their reliable operation and to maintain substation safety.To address issues such as complex wiring

high workload

and the potential for operational errors during discharge testing

this paper presents the design of a battery discharge monitoring communication device.The device enables communication between the battery inspection instrument and the charge discharge instrument.It uses the STM32F103C8T6 microcontroller as the core controller

incorporates a touchscreen for human machine interaction

and adopts the FreeRTOS operating system for task scheduling.Test results demonstrate that the proposed communication device successfully facilitates stable communication between the inspection and charge discharge instruments.It improves wiring efficiency by approximately 90 times

eliminates common disadvantages encountered during battery discharge testing in substations

and significantly enhances both the operational efficiency and safety of maintenance personnel.