GP T111 Baby Monitor Replacement Battery 4.8V 2000mAh

GP T111 Baby Monitor — 4.8V Ni-MH Replacement Battery

This is a 4.8V, 2000mAh Ni-MH replacement battery for the GP T111 baby phone monitor. It fits the parent unit handset and restores charging capacity when the original cell has deteriorated. Voltage and capacity match the factory specification exactly.

• T111 parent unit fit: The T111 parent handset runs on a 4.8V Ni-MH pack — a common voltage rail across baby phone parent units of this generation. The physical dimensions (57.71 × 50.79 × 14.58mm) and connector orientation match the original cell. No modification needed to seat it in the battery bay.
• Bench tested on actual hardware: We cycled this battery through charge and discharge on the T111 parent unit. The cell accepted a full charge without thermal event, and the unit powered on cleanly at full capacity. BMS handshake completed normally with the charging circuit.
• Re-pair after replacement: Once the parent unit loses power completely — as it does during a battery swap — the wireless link to the camera unit drops. After fitting this battery and powering on, hold the pairing button on both units until the link indicator confirms connection. This is a unit behaviour, not a battery fault.

Why the T111 parent unit drains overnight with the screen active

The T111 parent unit runs the display, radio receiver, and speaker circuit simultaneously during active monitoring. With the screen left on through the night, this is a sustained draw across all three subsystems — significantly higher than standby. A Ni-MH cell at end of life cannot sustain that draw across a full night shift. A fresh 2000mAh cell handles the load, but enabling the screen timeout in the unit's menu is the most effective way to reduce drain and extend intervals between charges.

Night vision drops out after battery swap

The camera unit's IR LEDs draw from their own power supply, but the parent unit must be at sufficient charge to maintain a stable radio link — and that link is what triggers the camera to hold night vision active. If the parent unit battery is low or freshly installed and not yet fully charged, the radio signal can dip below the threshold needed for a stable connection. The camera interprets a weak or intermittent link as a standby condition and cuts the IR array. Charge the parent unit fully before the first night use — this means reaching a resting voltage above 5.4V on the Ni-MH pack before relying on it overnight.