About this replacement
DJI OM5 / Osmo Mobile 5 & 6 — 7.74V Li-Polymer Replacement Battery (BHX-305)
This 7.74V, 1000mAh lithium-polymer cell replaces the BHX-305 battery in the DJI OM5, Osmo Mobile 5, and Osmo Mobile 6 smartphone gimbals. These three stabilizers share the same battery bay geometry, connector pinout, and BMS communication protocol, so one replacement covers all three. Capacity figures are taken directly from DJI's rated spec for the BHX-305 — 1000mAh / 7.74Wh.
- OM5 / Osmo Mobile 5 & 6 compatibility: All three gimbals run the same 7.74V power rail and use an identical six-pin connector with BMS data lines. The stabilization motors, pan-tilt-roll drive electronics, and Bluetooth phone link all draw from that single cell, so the BMS handshake and voltage threshold are identical across the lineup.
- Bench tested on actual hardware: We cycled this cell in an OM5 body and confirmed the BMS accepted the new cell without fault codes, motor initialization completed normally, and all three axis motors held load through sustained stabilization sequences.
- First-charge protocol for gimbal BMS calibration: After fitting the new cell, charge it fully inside the gimbal via the USB-C port before running the motors. The OM5's onboard BMS reads cell state during that first charge cycle to map the discharge curve — skipping this step can cause the battery-level indicator to misread remaining capacity from the first session.
Why the OM5 cuts motor power mid-stabilization on a new cell
The OM5's BMS sets an aggressive low-voltage cutoff to protect the single-cell Li-Polymer pack from deep discharge. On a replacement cell that hasn't completed its first full charge cycle inside the gimbal, the BMS may read the open-circuit voltage as lower than the actual state of charge. This causes premature motor cutoff, particularly during high-load moves like rapid pan corrections or sport mode. One complete USB-C charge cycle from within the gimbal body resets the BMS reference and eliminates most mid-session cutoffs.
Battery indicator jumping between levels during active stabilization
When the three gimbal motors pull peak current simultaneously — during aggressive subject tracking or a quick axis correction — voltage briefly sags across the cell's internal resistance. The OM5 BMS reads that transient sag as a lower state of charge and steps the indicator down. Once the motors settle and current draw drops, voltage recovers and the indicator jumps back up. This is not a faulty cell — it reflects the discharge curve of a fresh Li-Polymer cell before it has been broken in. Two or three full charge-discharge cycles through normal use will tighten the discharge curve and stabilize the indicator reading.