About this replacement
DJI Ronin-SC / RS3 / RS4 — 7.4V Li-ion Replacement Battery (RB2)
This 7.4V, 2450mAh Li-ion battery replaces the DJI RB2 cell used in the Ronin-SC gimbal stabiliser, BG18 Grip, Ronin RS3, and Ronin RS4. It slots into the same battery bay and connects through the same BMS handshake as the factory unit. Capacity is 18.13Wh — identical to the original spec.
- Ronin-SC, RS3, RS4 and BG18 Grip compatibility: All four platforms share the same 7.4V power rail, physical form factor, and BMS communication protocol. The RB2 part number covers all of them — the same cell drives all three brushless motor axes across this gimbal family.
- Bench tested on actual hardware: We ran this battery through full 3-axis motor load cycles on a Ronin-SC with a mirrorless camera body. The BMS held steady through repeated aggressive pan and tilt moves without triggering overcurrent cutoff.
- Balance before powering on: Balance the gimbal with your camera and lens attached before switching the unit on. An unbalanced load forces all three motors to draw compensating current continuously — that constant combined draw accelerates cell depletion and can push the BMS into a protection trip under a fast move.
Gimbal not initialising correctly after a battery swap
The Ronin-SC runs an IMU self-calibration sequence at every startup. That sequence requires stable, clean voltage from the moment you power on. A battery with a depleted or unrecovered cell can deliver a voltage dip in the first seconds of startup, causing the IMU to fail its calibration and leaving the gimbal locked or twitching. If the gimbal doesn't initialise cleanly after fitting this battery, charge the cell fully first — the BMS needs to see above 8.0V at rest before startup voltage stays stable through the calibration window.
Stabilisation drift starting before the battery indicator shows low
The Ronin-SC's battery indicator reads state of charge from voltage at rest, not under load. Under simultaneous 3-axis motor draw — common during a walking shot with an active subject — the cell voltage sags temporarily below what the motors need to hold their set positions. The result is visible axis drift or micro-correction jitter even when the indicator still shows two or three bars. If drift appears mid-shot, check that the tilt axis counterweight is set correctly — reducing the mechanical load on that axis is the fastest way to cut combined motor current and stop voltage sag from triggering the issue.