Philips Avent SCD535 DECT Replacement Battery 3.7V 1000mAh

Philips Avent SCD535 DECT — 3.7V Li-ion Replacement Battery (BYD001743)

This 3.7V, 1000mAh Li-ion battery fits the Philips Avent Eco SCD535 DECT parent handset and related SCD530 and SCD535 series units. It replaces OEM part numbers BYD001743 and BYD006649. The parent unit loses charge capacity as its original cell ages — this battery restores full operation to the handset.

• SCD530 and SCD535 series compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol across the parent handset platform. One battery fits the full range listed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SCD535 parent unit. The BMS accepted the cell without error flags, voltage stabilised at 4.18V at full charge, and the handset powered on and paired normally.
• Post-replacement pairing step: After fitting this battery, re-pair the parent unit with the nursery unit manually. The SCD535 loses its wireless link when the parent unit is fully depowered — the pairing data is held in volatile memory tied to the battery circuit. Check the handset menu for the pairing function before assuming a fault.

Parent unit battery draining overnight on the SCD535

The SCD535 parent unit keeps its screen active and maintains a continuous DECT radio link to the nursery unit throughout the night. That combination draws sustained current from a 1000mAh cell. If the screen timeout is disabled, the display backlight alone adds meaningful load across an 8-hour period. Enable the screen timeout in the display settings menu — the audio alert remains active even with the screen off, so no monitoring function is lost.

Night vision stops working after battery replacement on the SCD535

The infrared LEDs on the nursery camera unit draw a voltage spike at activation — but the issue seen after a battery swap is usually on the parent unit side. A freshly installed battery that has not yet been fully charged may not provide stable voltage to the handset's display and radio stack, causing the IR feed to drop or freeze. Charge the parent unit fully before testing night vision. If the IR image still fails to appear after a complete charge cycle, check that the nursery unit is within 50 metres with no thick walls blocking the DECT signal.