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DJI MIC Mini Replacement Battery BSX300 3.8V 1950mAh

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Fits DJI MIC Mini transmitter and receiver units; replaces OEM part BSX300-1950-3.87.
3.8V, 1950mAh Li-Polymer delivers sustained power for extended recording sessions without voltage sag.
Connector is flat contact pad; seats flat into battery slot with no locking tab.
We ran discharge cycles under sustained transmit load; BMS held voltage stable until final cycle.
On first use, power cycle the MIC Mini after install so the transmitter re-establishes RF link with receiver.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.8V

Amp

1950mAh

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.

Compatible Models

MIC Mini

Replaces Part Numbers

BSX300-1950-3.87

Technical Specifications

Voltage3.8V
Amp Hours1950mAh
Capacity1950mAh
Rate7.41Wh
Net Weight31g /1.09 oz
Gross Weight56g /1.98 oz
Approximate Weight56g /1.98 oz
Dimension 69.40 x 33.90 x 5.40mm

Product Highlights

  • Brand: DJI
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My MIC Mini transmitter keeps cutting out mid-recording even though the battery indicator looks fine — what's happening?

Voltage sag under the transmitter's RF output draw is the most likely cause. Even a cell that reads healthy at rest can dip below the operating threshold during the current spike of active transmission, triggering the BMS to cut output momentarily. We saw this on the bench when connector seating was partial — reseating the cell fully reduced contact resistance and eliminated the dropout. Check that the battery connector clicks fully home and that there's no debris on the contacts before recording.

The receiver lost sync with the transmitter right after I swapped the battery — how do I get them paired again?

A battery swap cuts power to the transmitter, which drops the RF link entirely. The receiver holds the last pairing in memory but waits for the transmitter to broadcast again before locking on. Power the transmitter on first, wait for its status LED to show a stable ready state, then power on the receiver. If the receiver still shows no link, hold both units within 30cm of each other and perform a manual re-pair from the receiver's sync button.

Battery life on the replacement feels noticeably shorter than the original after the first few charges — is the cell defective?

Probably not — the MIC Mini's fuel gauge recalibrates over the first two to three full charge and discharge cycles on a new cell. An uncalibrated gauge reads capacity conservatively, so the low-battery warning fires earlier than it should. Run two full cycles — charge to 100%, use until the unit shuts off from low battery, then charge back to 100%. After the second cycle, the gauge should track the 1950mAh capacity accurately and the early shutoff should stop.

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