Evolveo Sportcam A8 Replacement Battery 3.7V 900mAh

Evolveo Sportcam A8 — 3.7V Li-ion Replacement Battery

This is a 3.7V 900mAh Li-ion cell that fits the Evolveo Sportcam A8 action camera. It replaces the original battery that powers the camera's video capture, photo mode, and onboard processing. Swap it in when your original cell no longer holds a useful charge between shoots.

• Sportcam A8 fit: The A8 uses a compact 32.77 x 29.16 x 10.89mm cell at 3.7V nominal. This replacement matches that footprint and voltage rail so the battery seats correctly and the camera's charge circuitry operates within spec.
• Bench tested on actual hardware: We cycled this cell through charge and discharge passes on the bench, confirming the BMS protection triggers correctly at low-voltage cutoff and that charge acceptance from the camera body proceeds without fault codes.
• First-install charge cycle on the A8: Insert the new cell and charge it fully through the camera body before your first shoot. The A8's battery-remaining indicator maps to a discharge curve — a full charge cycle from within the camera body lets it calibrate the display reading accurately from the start.

Why the Sportcam A8 shows a dead-battery indicator on a freshly installed replacement cell

A new Li-ion cell ships at a partial state of charge — typically 40–60% — to slow self-discharge during storage. The A8's fuel gauge reads voltage against a stored discharge curve, and a mid-range starting voltage can map to a low or empty reading on the indicator. This is not a fault with the cell. Plug the camera into charge immediately after inserting the new battery. Once the charge cycle completes and the cell has been discharged and recharged once inside the camera, the indicator tracks correctly.

Battery percentage jumping erratically during recording on the A8

The A8 estimates remaining charge by measuring cell voltage at intervals. A replacement cell with a slightly different discharge curve than the original will produce voltage readings that don't match the indicator thresholds the firmware expects. This causes the percentage to jump — sometimes dropping 20% suddenly, then stabilising. Run two full charge-discharge cycles through the camera body. After the second cycle the indicator typically settles to within a few percent of the actual remaining charge, with resting cell voltage around 3.7V at the midpoint of the curve.