HelloBaby HB40 Replacement Battery 3.7V 3000mAh Li-Polymer

HelloBaby HB40 / HB6250 Baby Monitor — 3.7V Li-Polymer Replacement Battery

This 3.7V 3000mAh Li-Polymer battery replaces the rechargeable cell in the HelloBaby HB40 and HB6250 portable parent units. It fits the handheld receiver — the unit you carry around the house — not the camera base. When the original cell degrades and the parent unit dies faster than expected, this is the direct swap.

• HB40 and HB6250 parent unit compatibility: Both models share the same parent unit form factor, battery bay dimensions (58.50 × 40.00 × 9.40mm), and 3.7V supply rail. The connector and cell footprint are identical across the two, so one part number covers both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the HB40 parent unit. The BMS accepted the charge from the OEM cradle without fault flags, and the unit held a stable 3.7V nominal throughout normal monitoring operation.
• Re-pair after installation: After swapping the battery, the parent unit loses its saved wireless link to the camera. Power both units on, then run the pairing sequence from the parent unit menu — the camera will not appear on screen until you do this step.

Parent unit draining overnight during active monitoring

Running the HB40 parent unit all night with the screen active is a sustained draw on a 3000mAh cell. The LCD backlight, radio receiver, and speaker circuit all pull current simultaneously. The screen timeout setting — found in the display menu — lets the screen go dark while audio monitoring continues. This cuts the draw significantly and keeps the parent unit alive through a full night without a power connection.

Night vision not working after battery replacement

The IR LEDs on the camera unit are not affected by the parent unit battery swap — they run off the camera's own power supply. If night vision is missing after the swap, the issue is almost always an incomplete re-pair: the parent unit is receiving no signal at all and displaying a blank or frozen image. Run the full pairing sequence from the parent unit, confirm the camera feed appears in colour during daylight first, then switch to night mode. If the IR image still doesn't appear, check that the camera unit voltage reads above 4.9V on its charger before testing again.