Imou Cell 2 Camera FRB20 Replacement Battery 3.6V 5200mAh

Imou Cell 2 Camera — 3.6V Li-ion Replacement Battery (FRB20)

This is a 3.6V 5200mAh Li-ion replacement battery for the Imou Cell 2 wireless security camera. It matches the OEM part number FRB20 and fits directly into the Cell 2 housing. Capacity is sourced from the product specification — 18.72Wh total stored energy.

• Cell 2 platform fit: The Cell 2 uses a single-cell 3.6V Li-ion pack with a proprietary connector and an onboard BMS that manages charge cutoff and low-voltage protection. This replacement carries the same cell voltage and connector format, so the camera firmware recognises it without reconfiguration.
• Bench tested on actual hardware: We cycled this battery through the Cell 2's charge circuit and confirmed the BMS accepted charge from both USB input and the camera's solar terminal. Low-voltage cutoff triggered correctly at the expected threshold with no false trips during IR LED activation bursts.
• First-install power cycle: After fitting this battery, power cycle the camera once through the Imou app. The firmware must register the new cell before motion-triggered recordings log correctly to cloud storage — skipping this step can cause missed clips even though the camera appears online.

App showing 0% or wrong percentage after installing the Cell 2 battery

The Cell 2 does not use a fuel-gauge IC. It reads battery level by sampling cell voltage against a fixed threshold table stored in firmware. A new cell sitting at storage voltage — typically around 3.7V — can fall outside the expected range the firmware maps to a percentage, so the app displays 0% or a stale reading. One full charge-to-discharge cycle recalibrates the voltage-to-percentage mapping. After that cycle, the app reading should align with actual charge state.

Camera going offline in the Imou app after battery swap

Swapping the battery clears the camera's active session token, which the app uses to maintain the live connection. The camera comes back on the local network, but the app does not automatically re-establish the session. Open the Imou app, navigate to the device settings, and use the reconnect or re-register option to push a new token to the camera. If the camera still shows offline after that, check that the WiFi signal at the camera location is above -70 dBm — a weak signal causes repeated reconnect attempts that can trip the BMS under sustained current draw.