Sound Devices NH2054 14.4V Replacement Battery 6400mAh

Sound Devices Mixpre 10T lI / 833 — 14.4V Li-ion Replacement Battery (NH2054)

This is a 14.4V 6400mAh (92.16Wh) Li-ion replacement battery for the Sound Devices Mixpre 10T lI and 833 recorders. It matches the original NH2054 pack in voltage, connector, and BMS communication. Multi-day field shoots and remote locations demand a pack that holds its rated capacity from the first session.

• Mixpre 10T lI and 833 compatibility: Both recorders run the same 14.4V power rail and use the same battery connector and BMS handshake. One replacement pack covers either unit without modification or adapters.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Mixpre 10T lI, monitoring BMS cutoff thresholds and cell balance. The pack accepted a full charge without triggering protection circuits and delivered stable voltage under sustained multi-track recording load.
• First-session calibration on the Mixpre: After installing this pack, run the recorder through a complete charge-discharge-recharge cycle before heading into the field. The Mixpre maps battery state during that first full cycle, and skipping it causes the on-screen fuel indicator to report early low-battery warnings well before the pack is actually depleted.

Why the Mixpre 10T lI shuts down when all tracks arm simultaneously

Arming all tracks on the Mixpre 10T lI spikes current draw as preamps, phantom power circuits, and timecode circuitry all initialise at once. A weakened or partially discharged pack can sag below the BMS cutoff threshold in that instant, triggering an unexpected shutdown. This replacement pack's cells are matched to handle that inrush without voltage sag dropping below the protection threshold. If shutdowns persist after installing a fresh pack, check whether 48V phantom power is enabled on multiple channels simultaneously — that's the single largest contributor to peak draw.

Mixpre showing a full battery indicator immediately after install, then dropping fast

This happens because the recorder's fuel gauge is still calibrated to the voltage curve of the old, degraded pack. A fresh cell at 14.4V reads differently at each discharge stage than a worn cell, so the indicator loses accuracy until it relearns the curve. Run one complete discharge to the auto-shutoff point, then charge fully without interrupting the cycle. After that single conditioning run, the indicator will track the new pack's state accurately — the target resting voltage after a full charge should read 16.8V at the pack terminals.