Audioline BabySense 5 Video 3.7V 1400mAh Replacement Battery

Audioline BabySense 5 Video / Watch & Care V120–V131 — 3.7V Li-Polymer Replacement Battery (494521P)

This 3.7V 1400mAh Li-Polymer battery replaces the original power cell in the Audioline BabySense 5 Video parent unit and the Watch & Care V120, V130, and V131 series. It matches OEM part numbers 494521P and BPCK1500LI. Capacity is rated at 1400mAh / 5.18Wh — the same spec as the factory-fitted cell.

• BabySense 5 Video and Watch & Care V120–V131 compatibility: These parent units share the same PCB layout, connector pinout, and BMS handshake protocol, which is why a single cell covers the entire range. The 3.7V nominal rail and Li-Polymer flat-pack form factor (61.20 × 43.50 × 6.00mm) are consistent across all listed models.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a BabySense 5 Video parent unit. The BMS accepted the charge curve without tripping a fault flag, and the unit powered on cleanly. Cell voltage at full charge settled at 4.18V — within the expected Li-Polymer ceiling.
• Re-pairing after installation: After replacing the battery, place the parent unit within one metre of the camera unit and follow the manual pairing sequence. Baby monitors lose their stored wireless link when the parent unit is fully powered down — this is normal behaviour, not a fault with the new cell.

Why the BabySense 5 Video parent unit drains overnight with the screen on

Running the parent unit display continuously through the night is a sustained high draw on a 1400mAh cell. The backlit LCD and active radio link together pull enough current to exhaust the battery before morning. The Watch & Care series includes a screen timeout setting in the display menu — activating it drops average current draw significantly. Set the timeout to the shortest interval that still suits your monitoring routine.

Night vision not working after battery replacement

The IR LEDs on the camera unit are powered independently, but the parent unit's ability to switch into night vision mode depends on the radio link being stable — and that link is voltage-sensitive on the parent side. If the replacement cell has not been fully charged before first use, the parent unit may not transmit the mode-switch command reliably. Charge the parent unit to 4.18V (full green indicator) before testing night vision. If the issue persists after a full charge, re-pair the units as the camera may have dropped its pairing entry during the power interruption.