Topcom BabyViewer 2500 Replacement Battery 3.7V 1050mAh

Topcom BabyViewer 2500 / Babyviewer 4500 — 3.7V Li-ion Replacement Battery

This 3.7V 1050mAh Li-ion battery replaces the rechargeable cell in the parent unit of the Topcom BabyViewer 2500 and Babyviewer 4500 audio baby monitors. It restores power to the handheld parent unit when the original cell no longer holds a charge. Dimensions are 52 × 32 × 5mm — confirm these against your existing cell before ordering.

• BabyViewer 2500 and 4500 compatibility: Both models use the same parent unit hardware platform, sharing identical battery dimensions, connector type, and 3.7V supply rail — one cell covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The protection circuit triggered correctly at low-voltage cutoff and accepted a full charge without flagging errors on the parent unit.
• Wireless re-pair after swap: When the parent unit loses power completely, it drops its wireless link to the nursery unit. After fitting this battery, charge the parent unit before attempting to re-pair — a low starting voltage can cause the radio module to time out during the pairing handshake.

Parent unit battery draining overnight during monitoring

Running the parent unit through the night with the screen active is a sustained draw that taxes any 1050mAh cell. The display backlight and the 2.4GHz radio both pull current continuously when the screen stays on. Enable the screen timeout function in the parent unit menu — the radio stays active to receive alerts, but the display draw drops to near zero. This alone significantly extends the charge between top-ups.

Reduced wireless range immediately after fitting a new battery

The 2.4GHz radio module in the BabyViewer parent unit is voltage-sensitive. At a low state of charge — typically below 3.5V — the radio operates at reduced transmit power, which cuts effective range noticeably. This is not a faulty battery or a pairing fault. Charge the parent unit fully to 4.2V before the first use and test range again — most users see the issue resolve completely.