RED One SM-4230RC Compatible Battery 14.8V 12800mAh Li-ion

RED One / Epic / Scarlet Dragon — 14.8V Li-ion Replacement Battery (SM-4230RC)

This is a 14.8V, 12800mAh (189.44Wh) lithium-ion battery built to the SM-4230RC specification. It fits the RED One, Epic, and Scarlet Dragon cinema cameras. These cameras draw sustained high current during 4K RAW recording, and a full-capacity cell is critical for keeping the sensor, REDCODE processor, and fan running without interruption.

• One, Epic, and Scarlet Dragon compatibility: All three cameras share the same V-lock-adjacent power architecture and run off a 14.8V nominal rail. The BMS handshake is consistent across these bodies, so the same cell works in each without electrical modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the bench, monitoring the BMS cutoff thresholds and cell voltage under the sustained load that RAW recording places on the power rail. The protection circuit responded correctly at both the low-voltage cutoff and the charge termination point.
• First-install charge cycle on these bodies: Seat the battery and run a full charge cycle through the OEM RED charger before your first shoot. The RED One's fuel gauge calibration ties to that first cycle — skipping it causes the remaining-power indicator to read inaccurately throughout the cell's life.

Why the RED One's battery indicator stays stuck at one percentage for extended periods

The RED One maps its remaining-power display to a voltage-threshold table calibrated against the original cell's discharge curve. A new replacement cell — even at the correct capacity — discharges along a slightly different voltage slope, so the indicator can appear frozen at one reading before dropping sharply. This is a gauge calibration artifact, not a cell fault. Running two complete charge-discharge cycles through the OEM charger re-anchors the threshold table to the new cell's actual curve. After that, the display tracks normally across the full range.

Camera shows "no battery" or refuses to power on with a new cell seated

RED cinema bodies perform a BMS authentication check on first contact with a new cell. If the camera reads no battery or powers off immediately, the cell is not necessarily faulty — the camera's power management hasn't accepted the new unit yet. Remove the battery, reseat it firmly, and attempt a charge cycle in the OEM RED charger before inserting it back into the camera body. If the charger brings the cell to 16.8V (full charge) and the camera still rejects it after a power cycle, check the contact pins on the battery plate for oxidation.