About this replacement
Reolink Argus 3 Pro — 3.7V Li-ion Replacement Battery (Battery-Li7)
This is a 3.7V, 6000mAh (22.2Wh) lithium-ion replacement battery for the Reolink Argus 3 Pro wireless security camera. It uses OEM part numbers Battery-Li7, 01DQ0040-19T, and Li16. When the original cell loses capacity or stops holding charge, this swap restores the camera to full operation.
- Argus 3 Pro fit: The Argus 3 Pro uses a fixed 3.7V battery bay with a dedicated connector keyed to this cell's dimensions — 89.30 × 67.50 × 55.50mm. The BMS expects this exact voltage rail. A mismatched cell will either fail the handshake or prevent the camera from powering on.
- Bench tested on actual hardware: We ran this battery through full charge and discharge cycles on the Argus 3 Pro. The BMS registered the cell correctly, motion detection triggered without cutoff, and night-vision IR draw did not trip the protection circuit.
- First-install power cycle: After fitting the new battery, power cycle the camera once through the Reolink app. The firmware must register the new cell before motion events log correctly to cloud storage — skipping this step can cause missed recordings even when the battery reads charged.
App showing 0% or incorrect percentage after battery swap
The Argus 3 Pro uses a voltage-threshold indicator, not a fuel gauge IC. When a new cell is installed, the firmware has no reference point for that cell's charge curve yet. The indicator can display 0%, a frozen percentage, or an inflated reading until the camera completes one full charge-to-discharge cycle. Run the battery down past the low-battery alert once, then charge to full — the percentage readout will track correctly after that.
Camera goes offline in the app immediately after battery installation
Fitting a new battery cuts power to the camera's WiFi module, which clears the active session token stored in firmware. The Reolink app does not automatically re-establish the connection — it waits for a manual re-registration. Open the app, go to device settings, and trigger a reconnect or re-add the camera to the same network. If the camera still shows offline, confirm it is within range and that the 2.4GHz network SSID has not changed since the original setup.