Avent SDC361 Baby Monitor Replacement Battery 4.8V 700mAh

Avent SDC361 — 4.8V Ni-MH Replacement Battery

This is a 4.8V, 700mAh Ni-MH replacement battery for the Avent SDC361 baby monitor parent unit. It slots into the parent unit handset that communicates wirelessly with the nursery receiver. When the original cell no longer holds a charge, this is the direct replacement.

• SDC361 parent unit fit: The SDC361 parent unit runs on a 4-cell Ni-MH pack at 4.8V. That voltage rail powers the radio module, display, and speaker simultaneously. A worn cell drops voltage under load and triggers low-battery shutdown even when the indicator shows partial charge.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the SDC361 parent unit and confirmed the BMS accepted the cell without error flags. Voltage at full charge measured stable across all four cells with no imbalance detected.
• Post-swap pairing tip: After fitting this battery, the parent unit will have lost power completely during the swap — re-pair it with the nursery unit before use. Most SDC361 units drop their wireless link on full power loss and will show no signal until the pairing sequence runs again.

Parent unit draining overnight during active monitoring

Night-time monitoring with the screen on is a sustained draw on a 700mAh cell. The SDC361 parent unit powers the display backlight, radio receiver, and audio circuit continuously. A Ni-MH cell in shallow discharge cycles loses capacity faster than one that discharges fully — so if the unit has only ever topped up rather than fully cycled, effective capacity may already be reduced. Enable the screen timeout in the parent unit settings to cut display draw during overnight use.

Reduced range after fitting a new battery

The SDC361's radio module is voltage-sensitive — transmit power drops when cell voltage is low. A new Ni-MH cell straight from packaging typically reads below full charge. If range feels shorter after the swap, the battery likely hasn't completed its first full charge cycle yet. Place the parent unit on charge until the indicator shows full, then re-test range. A fully charged 4.8V Ni-MH pack should restore the unit to its normal operating radius.