ONeil 550041-100 Camera Replacement Battery 6V 2100mAh Ni-MH

ONeil 550041-100 (DR10) — 6V Ni-MH Replacement Battery

This is a 6V, 2100mAh Ni-MH replacement battery for ONeil portable camera equipment using part numbers 550041-100 or DR10. It matches the original cell's voltage rail and physical footprint at 89.10 x 46.50 x 19.10mm. If your unit has stopped powering on or the OEM cell no longer holds a charge, this is a direct swap.

• 550041-100 / DR10 platform compatibility: Both part numbers reference the same 6V Ni-MH cell format used across ONeil's portable imaging line. The shared voltage rail and connector pinout mean one cell covers all units that accept either OEM reference.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a calibrated load bench. The BMS accepted the cell without trip events, and terminal voltage held within spec across the full discharge curve.
• First-cycle initialisation for ONeil camera bodies: Run the first charge cycle inside the OEM charger or camera body before shooting. Some ONeil units require an in-body charge cycle to map the new cell's discharge curve correctly before the battery-remaining indicator reads accurately.

Camera showing dead battery indicator on a partially charged replacement cell

Ni-MH cells have a flatter discharge curve than lithium chemistries. Camera battery indicators calibrated to an aged OEM cell can misread a new cell's state of charge and report empty when the cell still has usable capacity. This is most common on first use before the camera has logged a full discharge cycle with the new cell. Run one complete charge-to-empty-to-charge cycle through the camera body, and the indicator will recalibrate to the new cell's curve.

Battery percentage jumping erratically on the camera display

The camera maps voltage thresholds to percentage steps based on how the original cell discharged. A new 2100mAh Ni-MH cell discharges at a slightly different rate than a worn OEM cell, so the camera's threshold table produces uneven percentage jumps. The indicator is not broken — the cell is just newer than what the camera last learned from. After one or two full discharge cycles logged in the body, the display stabilises. If it continues past three cycles, check that terminal voltage at the connector reads at or above 5.8V under light load.