NUK Eco Control + Video Replacement Battery LI-01 3.7V 1000mAh

NUK Eco Control + Video / 550VD — 3.7V Li-ion Replacement Battery (LI-01)

This is a 3.7V, 1000mAh Li-ion replacement battery for the NUK Eco Control + Video parent unit. It fits both the Eco Control + Video and the Eco Control Video Display 550VD. The OEM part number is LI-01.

• Eco Control + Video and 550VD compatibility: Both models share the same parent unit form factor, LI-01 connector pinout, and 3.7V power rail for the display and audio transmission circuit — one battery covers both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the parent unit. The BMS held voltage within spec across screen-on and audio-active states, and the protection circuit tripped correctly at low-voltage cutoff.
• Re-pair the parent unit after fitting: The Eco Control + Video loses its wireless link to the camera unit when the parent unit drops to zero volts. After fitting this battery, charge the parent unit fully, then hold the pairing button on both units until the connection indicator confirms a new link.

Parent unit not connecting to camera unit after battery swap

When the parent unit loses power completely — as it does during a battery swap — the 550VD and Eco Control + Video drop their stored wireless pairing data. The camera unit keeps broadcasting, but the parent unit comes back up without a registered receiver address. To restore the link, charge the parent unit to at least 3.9V before attempting re-pair — low voltage during pairing causes the radio module to time out before handshake completes. Hold the pairing button on the camera unit first, then on the parent unit, and wait for the solid connection indicator.

Night vision drops out or shows a dark screen after replacement

The IR LEDs on the camera unit are voltage-sensitive at the camera end, but the symptom often appears after a parent unit battery swap because the parent unit's radio signal drops in strength when the new battery is below full charge. A weak radio link causes the parent unit to display a black or broken image that looks like a night vision fault. Charge the parent unit fully to 4.2V before assuming the camera or IR system has failed. If the image clears once the battery is charged, the camera unit is fine.