Momcozy BM01 Baby Monitor Replacement Battery 3.7V 5000mAh

Momcozy BM01 — 3.7V Li-Polymer Replacement Battery (BAT-BBM-B2)

This 3.7V, 5000mAh lithium-polymer battery replaces the OEM pack in the Momcozy BM01 baby monitor parent unit. It fits the handheld parent unit handset that receives audio from the camera unit. Capacity figures come directly from the product data — 18.5Wh total stored energy.

• BM01 parent unit fitment: The BM01 parent unit runs a single-cell Li-Polymer pack at 3.7V nominal. This replacement matches that voltage rail, physical footprint (70.00 × 54.80 × 10.00mm), and the OEM connector orientation so the BMS handshake completes without error codes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the BM01 parent unit. The onboard BMS accepted the pack without triggering protection flags, and charge termination cut off cleanly at 4.2V as expected for a single Li-Polymer cell.
• Post-swap wireless re-pair: After fitting a new battery — especially if the parent unit lost power completely — the BM01 drops its stored camera link. Power both units on, then hold the pair button on the camera unit until the parent unit confirms the connection.

Parent unit not connecting to camera unit after battery swap

When the parent unit drops to zero volts during a battery swap, the volatile memory holding the camera pairing data clears. The unit powers on but shows no signal or a searching screen. This is not a battery fault. Power the camera unit on first, then hold the pair button until the parent unit picks up the signal — the process takes under 30 seconds on most BM01 setups.

Night vision feed dropping out after fitting a new battery

The BM01 camera unit's IR LEDs draw a sustained current load at night, and the parent unit's radio receiver also requires stable voltage to decode the signal cleanly. If the replacement battery ships partially discharged, the parent unit voltage sags under combined radio and display draw, and the night vision feed breaks up or freezes. Charge the parent unit to full — confirmed by the charge indicator reaching 4.2V — before the first overnight use. The feed stabilises once the cell is at full capacity.