Motorola MBP33 Replacement Battery 3.6V 700mAh TFL3X44AAA900

Motorola MBP33 / MBP36 Series — 3.6V Ni-MH Replacement Battery (TFL3X44AAA900)

This is a 3.6V, 700mAh Ni-MH rechargeable battery for the Motorola MBP33, MBP36, and MBP36PU baby monitor parent unit handsets. It replaces OEM part numbers TFL3X44AAA900 and CB94-01A. When the original battery no longer holds a charge, this swap restores full operation to the parent unit.

• MBP33, MBP36, and MBP36PU parent units: All three models use the same parent unit handset hardware, sharing the same 3.6V Ni-MH cell format, connector pinout, and charge management circuit. One battery fits all three without modification.
• Bench tested on actual hardware: We cycled this battery through the MBP33 parent unit's onboard charge circuit. The unit accepted the charge correctly, the low-battery indicator cleared at the expected state of charge, and the unit held its wireless link to the camera throughout the test.
• Re-pair after full power loss: When the parent unit drops to zero volts during a battery swap, it loses its stored link to the camera unit. After fitting this battery, charge it to full before attempting to reconnect — the radio module requires adequate voltage to complete the pairing handshake reliably.

Parent unit not connecting to camera unit after battery swap

The MBP33 and MBP36 parent units store the camera pairing data in volatile memory backed by the main battery. A full power interruption during a swap clears that link. The radio module also draws more current during the pairing handshake than during normal standby, so a partially charged battery may fail the process mid-sequence. Charge the new battery fully before re-pairing — then hold the pair button on the camera unit until the parent unit confirms the link.

Night vision not activating on the camera feed after replacement

Night vision loss after a battery swap is almost always a voltage issue, not a camera fault. The IR LED array in the camera unit requires a stable signal from the parent unit, and the parent unit's transmit power scales with battery voltage. A new Ni-MH cell sitting below 3.4V after installation may not drive the radio hard enough to send the IR-enable command reliably. Charge the parent unit to full — the camera's night vision should activate automatically once the parent unit reaches operating voltage.