Summer Infant 0209A Compatible Battery 4.8V 1500mAh HK1100AAE4BMJS

Summer Infant 0209A / 02090 / 0210A / 02720 — 4.8V Ni-MH Replacement Battery (HK1100AAE4BMJS)

This 4.8V, 1500mAh Ni-MH battery replaces the original pack in the Summer Infant 0209A, 02090, 0210A, and 02720 parent units. It matches OEM part numbers HK1100AAE4BMJS and 02100A-10. When the original cell degrades, the parent unit loses charge capacity and fails to hold power through the night — this swap restores normal operation.

• 0209A / 02090 / 0210A / 02720 parent unit fit: All four models share the same parent unit housing, connector pinout, and 4.8V Ni-MH cell configuration. One battery part number covers the full range because the power circuit and BMS handshake are identical across this product family.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the parent unit platform. The BMS accepted the cell stack without fault, charge termination triggered correctly at capacity, and voltage held stable across screen-on and night-vision-active states.
• Re-pair the parent unit after fitting: A complete loss of power — which happens during a battery swap — clears the wireless link between the parent unit and camera. After fitting this battery, press and hold the pair button on the camera unit, then confirm the link from the parent unit menu before relying on the monitor.

Parent unit not connecting to the camera unit after battery swap

Summer Infant parent units store their camera pairing in volatile memory that resets when power drops to zero. Swapping the battery causes exactly that — a full power interrupt. The camera unit continues broadcasting, but the parent unit has lost its registered channel and cannot receive the signal. Go to the parent unit's pairing menu, hold the sync button on the back of the camera until the LED flashes, and confirm the connection on the parent unit screen. The monitor will resume normal operation once the link is re-established.

Night vision cutting out on the parent unit screen after replacement

The IR LEDs on the camera unit draw from the camera's own power supply, but the parent unit's ability to decode and display the IR image depends on its own voltage being stable. A freshly installed Ni-MH pack straight from storage may sit below 4.5V until it completes its first full charge cycle. At low voltage, the display chipset reduces processing load and the night vision feed is the first casualty. Charge the parent unit fully before testing night vision — wait for the charge indicator to clear, then confirm the IR image is visible at 4.8V nominal.