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In the process of rapid construction of 5G network infrastructure, due to large-scale expansion and replacement of old and new batteries in communication room, there are a large number of waste batteries left in the project. Aiming at these problems, this paper analyses the problems of voltage clamp and current shunt in direct parallel use of existing batteries, and puts forward the research on parallel isolation management technology of batteries in communication room. Using the technologies of time-division, separation, current control and dynamic PWM adjustment of combined pulse width, we effectively solve many problems in parallel operation of batteries with different factory time and types. Finally, the feasibility of the system design is verified by demonstration.