About this replacement
DJI MIC Mini — 3.8V Li-Polymer Replacement Battery (BSX300-1950-3.87)
This 3.8V, 1950mAh Li-Polymer battery replaces the OEM cell in the DJI MIC Mini wireless microphone system. It fits the compact transmitter and receiver units used by content creators and videographers. Capacity is 7.41Wh — matching the original power envelope for the MIC Mini platform.
- MIC Mini transmitter and receiver fit: Both units share the same battery footprint, voltage rail, and connector spec. The BSX300-1950-3.87 cell slots into either housing without adapter or modification. The BMS in each unit expects a 3.8V Li-Polymer profile, and this cell meets that handshake.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the MIC Mini transmitter. The onboard BMS accepted the cell without error flags, charge termination triggered correctly at capacity, and the protection circuit cut output cleanly at the low-voltage threshold.
- Firmware and charge cycle tip for MIC Mini: After swapping the cell, let the unit charge to 100% before first use. The MIC Mini's fuel gauge calibrates its capacity estimate against a full charge cycle — skipping this step can cause the battery indicator to read inaccurately for the first several sessions.
Why the MIC Mini transmitter drops audio mid-recording after a battery swap
Li-Polymer cells with slightly elevated internal resistance can sag below the transmitter's operating voltage floor during the brief high-current spike of RF transmission. The MIC Mini's BMS reads this sag as a low-battery event and cuts power to protect the cell. This happens even when the battery indicator shows a healthy charge level. If dropouts start within the first few sessions on a new cell, check that the replacement cell's connector is fully seated — a partial connection increases contact resistance and amplifies voltage sag under transmit load.
Transmitter shows full charge but powers off seconds after turning on
This is a BMS re-initialisation issue, not a cell defect. When a deeply discharged Li-Polymer cell is installed, the protection circuit can lock out output until it receives a valid charge pulse. Connect the transmitter to the charging case or a USB-C source immediately after install — do not attempt to power it on first. Hold the charge for at least 10 minutes before switching on. If the unit still shuts down, check that cell voltage has recovered above 3.5V using a multimeter at the connector pins before reinstalling.