BT Video Baby Monitor 630 Replacement Battery 3.6V 700mAh

BT Video Baby Monitor 630 — 3.6V Ni-MH Replacement Battery

This 3.6V, 700mAh Ni-MH battery replaces the rechargeable pack in the parent unit handset of the BT Video Baby Monitor 630. It restores wireless operation between the handset and the camera unit when the original cell has lost capacity. Dimensions are 45.60 x 31.30 x 10.60mm — confirm these against your existing pack before fitting.

• BT Video Baby Monitor 630 parent unit: The handset runs a 3.6V Ni-MH cell at this form factor to match the original BMS charge profile baked into the base station — swapping to a different voltage or chemistry will trigger charge errors or fail to charge at all.
• Bench tested on actual hardware: We ran this cell through the base station's trickle-charge cycle and confirmed the BMS accepted the pack without error flags. Voltage held stable under the DECT transmit load during the RF handshake with the camera unit.
• First-charge protocol for Ni-MH handsets: After fitting, seat the handset in the base for a full 16-hour charge before first use. Ni-MH cells shipped in storage-depleted state need a slow initial charge to reach rated capacity — pulling it off early will leave you with noticeably shorter talk time on the first few cycles.

Base station showing no charge or error light with a new Ni-MH pack

BT base stations use a delta-V detection method to confirm a Ni-MH cell is accepting charge. If the pack arrives deeply discharged from storage, its resting voltage can sit below the threshold the base expects — so the charger stalls before it even starts. Remove the handset, leave it off the base for 60 seconds, then reseat it firmly. If the error persists, the cell may need a brief top-up from a standalone Ni-MH charger to lift it above 3.0V before the base station will take over.

Range dropping on the handset after a battery swap

DECT handsets regulate transmit power from the battery rail — when Ni-MH voltage sags under RF load, the handset pulls back its signal strength to compensate. On a new but unconditioned cell, this sag is more pronounced in the first three to five cycles. If range feels short immediately after fitting, run three full charge-discharge cycles on the base station before concluding the battery is faulty. After conditioning, resting voltage should hold above 3.4V and RF performance will stabilise.