ILumen CAM-S2 Baby Monitor Compatible Battery 3.7V 750mAh

ILumen CAM-S2 — 3.7V Li-Polymer Replacement Battery

This 3.7V, 750mAh Li-Polymer battery fits the ILumen CAM-S2 baby monitor parent unit. It replaces the original cell when the parent unit stops holding charge or shuts down unexpectedly during monitoring sessions. Dimensions are 37.20 × 32.70 × 5.20mm — verify these against your existing cell before fitting.

• CAM-S2 parent unit fit: The CAM-S2 parent unit runs a 3.7V single-cell Li-Polymer architecture. This replacement matches that voltage rail and physical footprint. The BMS on the parent unit monitors cell voltage to protect against over-discharge during overnight use.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted the cell without fault flags, and charge acceptance at the connector was consistent across multiple cycles at the rated 750mAh capacity.
• Wireless link after power loss: After replacing the battery, re-pair the parent unit with the camera unit. The CAM-S2 loses its stored wireless channel link when the parent unit is fully de-powered. Follow the pairing sequence in the manual before your first overnight monitoring session.

Parent unit not connecting to camera after battery swap

When the parent unit loses power completely — as it does during a battery replacement — the CAM-S2 clears its stored wireless pairing data. The camera unit is still transmitting, but the parent unit no longer knows which channel to listen on. This is not a fault with the replacement battery. Power both units on, then run the pairing sequence from the parent unit menu to re-establish the link.

Night vision not activating after fitting the new cell

The CAM-S2 camera unit's IR LEDs draw a spike of current when switching from daylight to night vision mode. If the parent unit battery is not sufficiently charged after fitting, the voltage at the radio receiver can sag below the threshold needed to maintain a stable video feed during that IR switchover. The monitor may appear to freeze or show a black screen instead of the IR image. Charge the parent unit fully before the first overnight session — this resolves the issue in most cases.