V Tech RM5752 Baby Monitor Replacement Battery 3.7V 1900mAh

V Tech RM5752 / RM5762 — 3.7V Li-Polymer Replacement Battery (BT290865)

This 3.7V, 1900mAh Li-Polymer battery replaces the BT290865 in the parent unit of the V Tech RM5752 and RM5762 digital baby monitors. It slots into the parent unit handset and restores charging capacity lost through extended daily use. Dimensions are 60.00 × 57.00 × 5.30mm — confirm your original matches before ordering.

• RM5752 and RM5762 shared battery platform: Both models use the same parent unit hardware, the same 3.7V single-cell Li-Polymer pack, and the same BT290865 part number. The connector and BMS handshake are identical across both variants.
• Bench tested on actual hardware: We ran the BT290865 replacement through a full charge cycle on the RM5762 parent unit. The BMS accepted the charge without flagging a fault, and the unit exited low-battery warning at the expected voltage threshold.
• Re-pair after swapping the battery: The RM5752 and RM5762 parent units lose their wireless link to the camera unit when power is fully interrupted. After fitting this battery, follow the pairing sequence in your manual — typically holding the pairing button on both units — before the monitor will display a live feed.

Parent unit battery draining overnight on the RM5752

Running the RM5752 parent unit all night with the screen active is a sustained draw on a single 1900mAh cell. The backlit display and continuous 2.4GHz radio link together pull significantly more current than standby mode. Over months of nightly use, this cycling pattern degrades capacity faster than typical daytime use. Enable the screen timeout setting in the monitor menu so the display shuts off while audio monitoring continues.

Night vision stops working after fitting a new BT290865

The IR LEDs on the RM5752 camera unit need the parent unit radio link at full signal strength to trigger correctly — this isn't a camera fault. If the parent unit battery is not fully charged after installation, the transmit voltage sags just enough to cause intermittent IR activation. Charge the parent unit to 100% before testing night vision. If IR still doesn't activate, re-pair the units and recheck at 4.2V charge state.