HeimVision Soothe 3 Baby Monitor Replacement Battery 3.7V 3000mAh

HeimVision Soothe 3 — 3.7V Li-Polymer Replacement Battery (BAT-HV3-A2)

This 3.7V, 3000mAh lithium-polymer battery replaces the OEM pack in the HeimVision Soothe 3 baby monitor parent unit. It fits directly using part number BAT-HV3-A2 and restores power to the portable handset that receives audio and video from the camera unit. Capacity is rated at 11.1Wh, matching the original specification.

• Soothe 3 parent unit fit: The Soothe 3 parent unit runs its display, wireless receiver, and speaker from a single Li-Polymer cell at 3.7V nominal. This pack matches that voltage rail and uses the same connector and physical dimensions (62 x 50 x 7.5mm), so the BMS handshake completes without error on boot.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Soothe 3 parent unit. The BMS accepted the pack on first connection, the charge indicator progressed normally, and the unit maintained its camera link throughout the full discharge test.
• Re-pair after full power loss: The Soothe 3 parent unit stores its camera pairing in volatile memory. When the battery is swapped and the unit loses power completely, that pairing clears. After installing this pack, hold the pairing button on both the parent unit and camera unit until the link indicator confirms re-connection.

Parent unit not connecting to camera unit after battery swap

Removing the original battery cuts all power to the parent unit, which clears the stored camera pairing. The Soothe 3 does not retain its wireless link through a full power interruption — this is expected behaviour, not a fault with the new battery. To restore the connection, press and hold the pairing button on the camera unit first, then on the parent unit, until both indicators confirm the link. The camera feed will resume once the handshake completes at the unit's operating frequency.

Night vision not activating after fitting a replacement battery

The IR LEDs on the Soothe 3 camera draw more current than the standard video feed and require a stable voltage supply from the parent unit's receiver circuit. If the new battery is at a low state of charge when first installed, the parent unit may display the camera feed in colour but fail to switch the IR mode on in low light. Charge the parent unit to full before testing night vision — the IR cut filter switch and LED array both need the voltage rail above approximately 3.6V to operate correctly. If night vision still fails after a full charge, the issue is in the camera unit rather than the battery.