Astak Action Pro Replacement Battery 3.7V 900mAh

Astak Action Pro / CM7000 Series — 3.7V Li-Polymer Replacement Battery

This 3.7V, 900mAh lithium-polymer cell replaces the internal battery in the Astak Action Pro, Action Pro CM7000, CM7000, and CM-7200 compact action cameras. It matches the original cell's dimensions at 37.84 × 31.71 × 11.36mm, fitting the battery compartment without modification. Capacity is drawn from product specification at 900mAh (3.33Wh).

• Action Pro and CM7000 platform fit: Both the Action Pro and CM7000 variants share the same battery bay geometry and 3.7V single-cell power rail, which is why one cell covers the full model range. The connector orientation and contact spacing are identical across these models.
• Bench tested on actual hardware: We cycled this cell through the CM7000 body, confirming the BMS accepted the cell at first charge and that the protection circuit tripped correctly at low-voltage cutoff — no runaway discharge occurred.
• First-use charge cycle on CM7000: Charge this cell fully inside the camera body before your first recording session. The CM7000's battery indicator maps charge state from a calibration point set during that initial in-body charge — skipping it causes the indicator to read inaccurately from the start.

Why the Action Pro shows a dead battery icon on a freshly installed replacement

The Action Pro's BMS checks resting voltage before unlocking normal operation. A new cell shipped in storage may sit at 3.5V or below — below the camera's acceptable threshold — even though the cell is not depleted. The camera reads this as a flat or missing battery and refuses to boot. Place the cell in the camera and connect it to charge via USB for at least 15 minutes before attempting to power on; once the cell climbs above 3.6V, the camera will boot normally.

Battery percentage jumping or stalling mid-recording session

The CM7000 maps its fuel gauge against a fixed discharge curve calibrated to the original cell. A replacement cell with a slightly different discharge profile causes the indicator to jump — often dropping 20% suddenly or holding at a fixed percentage for an extended period before falling quickly to zero. This is a gauge calibration mismatch, not a fault in the cell itself. Run two full charge-discharge cycles inside the camera body and the indicator will track the new cell's curve more accurately, settling within a few percent of actual charge state.