Contour ContourHD Replacement Battery 3.7V 1050mAh

Contour ContourHD 1080p / 2035 / 1200 Series — 3.7V Li-ion Replacement Battery

This 3.7V, 1050mAh lithium-ion cell is a direct replacement for the battery pack used in the Contour ContourHD action camera line, including the ContourHD 2035, ContourHD 1080p, and ContourHD 1200. It matches the original cell's voltage, physical footprint (52.92 x 33.78 x 5.48mm), and connector orientation. No OEM part number exists for this cell — fit is confirmed by model match.

• ContourHD model family fit: The 2035, 1080p, and 1200 variants all share the same battery bay geometry and 3.7V single-cell power rail. The BMS in each model uses the same voltage thresholds for charge acceptance and low-voltage cutoff, so one cell services the full lineup without modification.
• Bench tested on actual hardware: We cycled this cell through the ContourHD charge circuit and confirmed the BMS accepted the cell without error flags. Charge termination triggered correctly at 4.2V, and the low-voltage cutoff engaged at the expected 3.0V floor.
• First-cycle initialisation on ContourHD bodies: Run the first charge inside the camera body rather than a third-party external charger. The ContourHD BMS maps its battery-remaining indicator against an internal charge profile — a first cycle through the camera body lets it calibrate the discharge curve correctly for accurate level readings.

Why the ContourHD shows a dead-battery indicator on a partially charged replacement cell

The ContourHD reads remaining charge by mapping resting voltage against a fixed discharge curve stored in the camera firmware. A new replacement cell has a slightly different internal resistance profile than the depleted original, which causes the voltage-to-percentage translation to misread at first. The camera may show one bar or a flashing empty indicator even when the cell is at 3.8V or above. One full charge-discharge cycle through the camera body resets the indicator to track the new cell's actual curve.

ContourHD cutting to standby mid-recording without warning

Sustained 1080p recording draws continuous current from the sensor, processor, and storage controller simultaneously — peak draw spikes noticeably higher than idle. If the cell voltage sags under load to the BMS cutoff threshold (approximately 3.0V), the camera shuts down immediately without saving a warning state. This often happens with a cell that has aged beyond its usable cycle count, where internal resistance has climbed enough to cause voltage sag under load even when the resting voltage looks acceptable. Check resting cell voltage with a multimeter — anything reading below 3.6V at rest signals the cell needs replacement.