V Tech LF915 Baby Monitor Replacement Battery 3.7V 5000mAh

V Tech LF915 / LF920 / LF930 HD — 3.7V Li-Polymer Replacement Battery (164105)

This is a 3.7V 5000mAh Li-Polymer battery for the V Tech LF915, LF920, LF930 HD, and RM5754 baby monitor parent units. It replaces OEM part number 164105. When the original battery stops holding a charge, the parent unit loses its ability to be carried around the home — this battery restores that portability.

• LF915 / LF920 / LF930 HD / RM5754 parent unit fit: These models share the same parent unit chassis, battery bay dimensions, and connector pinout. All run on the same 3.7V Li-Polymer cell with identical BMS handshake requirements — one battery number covers the group.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the parent unit. The BMS accepted the charge without triggering overcurrent cutoff, and the unit held its wireless link to the camera throughout the test.
• Re-pair the parent unit after fitting: The LF915 and its siblings lose the wireless pairing to the camera unit when the parent unit is fully powered down. After fitting this battery, run the pairing sequence from the parent unit menu before expecting video or audio from the camera.

Parent unit battery draining overnight on the LF915

The LF915 parent unit runs the screen, radio receiver, and IR detection circuit simultaneously during night-time monitoring. If the screen stays on continuously, total draw across those three systems is sustained — not light-draw standby. The fastest fix is enabling the screen timeout in the display settings, which drops the parent unit into a lower-draw audio-only mode while keeping the radio link alive. A 5000mAh cell handles overnight use comfortably in screen-timeout mode; leaving the screen active all night will show visible capacity loss by morning.

Night vision stops working after battery replacement

The camera unit's IR LEDs draw from the camera's own power supply, but the parent unit's radio receiver needs adequate voltage to decode and display the IR-enhanced feed correctly. If the replacement battery ships at a low state of charge, the parent unit may show a blank or degraded image in dark mode. Charge the parent unit fully before testing night vision — target a full charge indicator on the unit's display. If night vision still drops out, check that the camera unit itself is on mains power and positioned within 5 metres for initial pairing confirmation.