DJI MIC Receiver Compatible Battery 3.7V 200mAh PCT502025

DJI MIC Receiver — 3.7V Li-Polymer Replacement Battery (PCT502025)

This 3.7V, 200mAh lithium-polymer battery replaces the original cell in the DJI MIC Receiver and MIC Transmitter units. It fits the receiver (MIC RX) and transmitter (MIC TX) used in DJI's compact wireless microphone system. Swap it when the original cell no longer holds a charge through a full shoot.

• MIC RX and MIC TX compatibility: Both the receiver and transmitter units share the same cell format, voltage rail, and connector pinout. The PCT502025 part number covers both housings — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the MIC Receiver and confirmed the BMS accepted the pack without triggering a protection cutoff. Voltage held steady across combined DECT radio and audio processing draw.
• First-charge protocol for the MIC Receiver: Charge the unit fully via its USB-C port before taking it into the field. The receiver's onboard BMS needs one complete charge cycle to calibrate the battery state display accurately — skipping this means the indicator will read incorrectly from the first use.

Why the MIC Receiver drops the wireless link during active recording

The MIC Receiver runs its 2.4GHz radio link and audio decoding simultaneously — two constant draws from a 200mAh cell. When the cell ages, internal resistance rises, and voltage sags under the combined load. The BMS reads that sag as a low-cell event and cuts output to protect the cell. The result looks like a dropout or disconnection, not a low-battery warning. Replacing the cell restores the voltage headroom the BMS needs to stay open under peak draw.

Battery indicator reads full but the receiver shuts off after a few minutes

This happens when the new cell arrives at storage voltage — typically around 3.6–3.7V — and the receiver's fuel gauge hasn't run a calibration cycle yet. The indicator shows full because the resting voltage looks healthy, but the BMS cuts off the moment load drops it below threshold. Run one full charge to 4.2V followed by a complete discharge cycle. After that single cycle, the gauge and BMS cutoff will track actual capacity correctly.