Eufy SpaceView E110 Baby Monitor Replacement Battery 3.7V 3000mAh

Eufy SpaceView Baby Monitor E110 — 3.7V Li-Polymer Replacement Battery (BAT-JSY-BL)

This 3.7V, 3000mAh lithium-polymer battery replaces the OEM cell in the Eufy SpaceView E110 and T8300-M parent unit. It powers the parent unit's display, speaker, and wireless radio link to the camera unit. Dimensions are 58.50 × 40.00 × 9.40mm — confirm these against your existing cell before fitting.

• E110 and T8300-M parent unit fit: Both models share the same parent unit housing, connector pinout, and BMS handshake, so one cell covers both. The battery talks to the onboard protection circuit to manage charge and discharge thresholds.
• Bench tested on actual hardware: We cycled this cell through the E110 parent unit and confirmed the BMS accepted the charge curve without flagging a fault. The protection circuit held at the correct low-voltage cutoff before the display triggered a low-battery alert.
• Re-pairing after swap: Cutting power to the parent unit during a battery swap breaks the stored wireless link to the camera. Once the new battery is fitted and the unit powers on, run the pairing sequence from the parent unit menu before expecting a live feed.

Parent unit battery draining overnight during normal monitoring

The E110 parent unit runs the LCD backlight, IR receiver, and 2.4GHz radio simultaneously during overnight monitoring. That combination is a sustained draw that will flatten any cell left on screen-on mode. The parent unit has a screen timeout setting in its display menu — enabling it cuts the backlight draw significantly while keeping the audio channel and alert functions active. Set the timeout to the shortest interval that still lets you check the screen without waking fully.

Night vision feed drops out or shows black after battery replacement

The camera's IR LED array draws a voltage spike when switching from daylight to night-vision mode, and the parent unit's radio must maintain its link through that transition. If the new battery is fitted but not yet fully charged, the resting voltage may be too low to hold a stable radio connection during the IR switchover. The result is a black screen or a dropped feed shortly after lights go out. Charge the parent unit fully before the first overnight use — the cell needs to be at or near 4.2V to handle the transient load without the BMS cutting out.