RED One Cinema Camera 14.8V Replacement Battery SM-4230RC

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

This is a 14.8V, 6400mAh (94.72Wh) lithium-ion battery built to the SM-4230RC specification. It fits the RED One, Epic, and Scarlet Dragon cinema cameras. Voltage and capacity match the OEM spec for these bodies.

• One, Epic, and Scarlet Dragon compatibility: All three platforms share the same battery bay format, 14.8V nominal rail, and connector pinout. The SM-4230RC spec covers the BMS communication handshake common across this RED camera line, so the same cell works across all three bodies without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a RED-compatible body and logged BMS handshake acknowledgement on first install. The protection circuit responded correctly to charge termination and low-voltage cutoff without tripping prematurely under the camera's sustained 4K sensor and recording load.
• First-install charge cycle on RED bodies: Charge this battery fully via the OEM RED charger or directly in the camera body before your first shoot. Some RED bodies require a complete charge cycle from within the camera to calibrate the battery-remaining display — skipping this step can cause the indicator to read inaccurately from the first use.

Why RED cinema cameras run a BMS authentication check on new cells

RED camera bodies query the battery's BMS over the communication pins before displaying charge state or allowing full operation. A new third-party cell may not pass this check on the very first power-on if the BMS hasn't completed an initial charge handshake. This is a one-time initialisation step, not a fault. Charge the cell to 100% in the OEM RED charger, then re-insert — the body will recognise it and report charge state correctly from that point forward.

Battery percentage jumping erratically on the RED body display

RED bodies map the battery percentage indicator against a voltage-threshold curve calibrated to the OEM cell's discharge profile. A replacement cell with a slightly different discharge curve can cause the display to jump — for example, reading 80% then dropping to 55% within a short period without heavy use. This isn't a capacity fault; it's the indicator mapping voltage readings differently to the new cell. Run one full discharge-to-cutoff cycle followed by a full charge, and the body's BMS will recalibrate its threshold mapping to the replacement cell's actual curve. Target a full charge to 16.8V before returning to use.