Odys Multicam MC-A8 Replacement Battery 3.7V 1050mAh Li-ion

Odys Multicam MC-A8 / MC-HD800 / MDV-HD8 — 3.7V Li-ion Replacement Battery

This 3.7V, 1050mAh Li-ion cell is a direct replacement for the Odys Multicam MC-A8 and compatible Odys Multicam action cameras. It fits the MC-HD800, MDV-HD8, and MDV Opto HD8000 alongside the MC-A8. Capacity is 1050mAh (3.89Wh) — matching the original cell specification.

• Multicam series compatibility: The MC-A8, MC-HD800, MDV-HD8, and MDV Opto HD8000 share the same battery form factor — same footprint at 53.20 x 35.30 x 7.10mm, same 3.7V nominal rail, and the same contact configuration. One replacement cell covers all four models.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, monitoring BMS cutoff at the low-voltage threshold. The protection circuit triggered cleanly at cell depletion without voltage sag causing a hard shutoff mid-recording.
• First-install charge cycle: On first use, run one full charge inside the camera body before recording. Some Multicam units map the battery-remaining indicator against charge data logged during an in-body cycle — skipping this step can cause the indicator to read incorrectly from the first session.

Why the MC-A8 battery indicator reads full then drops suddenly mid-recording

The MC-A8 uses a voltage-threshold method to estimate remaining charge. Li-ion cells hold a flat voltage curve through most of their discharge, then drop steeply near the end. A replacement cell with a slightly different internal resistance will track that curve differently from the original, so the indicator appears stable until the voltage cliff hits. At that point the camera reads the drop as near-empty and the display collapses fast. Performing a full in-body charge cycle on first use lets the camera recalibrate its threshold mapping to the new cell.

Camera shows dead battery symbol immediately after inserting a charged replacement cell

This happens when the cell voltage sits just below the camera's minimum recognition threshold — typically below 3.4V — after storage. The BMS in compact action cameras like the MC-A8 will display a dead-battery icon rather than attempting to boot. Place the cell in an external charger or connect the camera to USB power and let it charge for at least 15 minutes before powering on. Once the cell rises above 3.5V, the camera will recognise it and boot normally.