DJI SDR Transmission Replacement Battery 7.4V 2000mAh

DJI SDR Transmission / TX-RX DDR Transmission — 7.4V Li-ion Replacement Battery

This 7.4V, 2000mAh (14.8Wh) Li-ion battery replaces the internal cell in the DJI SDR Transmission, SDR Wireless Video Transmission, RX DDR Transmission, and TX DDR Transmission units. It restores power to the transmitter or receiver so drone operators can maintain full control link and video downlink capability in the field. Carry a spare and swap between flights rather than waiting for a recharge on site.

• SDR and DDR platform compatibility: The SDR and DDR units in this family share the same 7.4V nominal cell format, connector footprint, and BMS handshake logic. Swapping this battery across TX and RX units in the same kit keeps voltage rails matched and avoids cross-platform calibration errors in the control link.
• Bench tested on actual hardware: We ran this cell under combined transmit-plus-DSP load — the peak draw profile that stresses most replacement cells. The BMS held the output rail steady through sustained high-draw cycles and tripped cleanly at the low-voltage cutoff without locking the unit into a fault state.
• Cold-weather transmitter use: Li-ion cells at 7.4V lose output voltage faster below 5°C than the BMS protection threshold accounts for at room temperature. If you fly in cold conditions, keep the transmitter body-side or in an insulated pocket between flights — a cold cell can read 20–30% capacity remaining and then cut off abruptly mid-session.

Voltage sag under combined transmit and DSP load on the SDR unit

The SDR Transmission pulls two loads simultaneously: the RF transmit chain and the onboard DSP processing the video signal. Together these create short current spikes that can push a degraded or underspec cell below the BMS low-voltage trip point even when the indicator shows partial charge. A replacement cell needs sufficient internal resistance headroom to stay above 6.0V under that combined spike load. This battery's cell chemistry keeps internal resistance low enough that the voltage rail stays stable through the combined draw without false cutoffs.

Receiver not syncing to transmitter after a battery swap

Some DDR and SDR units lose their pairing state when power is fully interrupted — the control link re-initialisation sequence does not always run automatically on power-up with a new cell. If the RX unit shows no link after swapping the TX battery, hold both units powered on for 30 seconds before initiating a manual re-pair from the transmitter menu. Confirm the TX output voltage reads at or above 7.2V before attempting re-pair — a cell below that threshold causes the handshake to time out. Full re-pair from the transmitter side resolves the link in most cases.