ERA 31101 Baby Monitor Replacement Battery 3.7V 1050mAh

ERA 31101 / 32103 / 32104 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1050mAh Li-ion battery for the ERA baby phone parent unit. It fits the 31101, 32103, and 32104 models. At 52 x 32 x 5mm, it matches the original cell's footprint and connector layout.

• 31101, 32103, and 32104 compatibility: These three ERA parent units share the same 3.7V single-cell architecture, connector pin-out, and BMS communication protocol — which is why one cell works across all three. The voltage rail and charge termination logic are identical.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and monitored BMS cutoff thresholds. Charge acceptance was clean, the protection circuit tripped correctly at low-voltage cutoff, and no anomalous heat was recorded during discharge.
• Re-pairing the parent unit after swap: ERA baby monitors lose their wireless link when the parent unit drops to zero volts. After fitting this battery, power the parent unit on and run the pairing sequence manually before placing it back in the nursery — the camera unit will not reconnect automatically.

Parent unit battery draining faster at night with screen active

Night-time monitoring with the screen on is a sustained draw that compounds over a full overnight session. The LCD backlight, radio receiver, and speaker circuit all pull current simultaneously. A 1050mAh cell at 3.7V gives 3.89Wh — that budget shrinks fast if the screen never sleeps. Enable the screen timeout in the ERA parent unit menu so the display cuts after a set period while audio monitoring stays active.

Night vision cuts out shortly after battery replacement

The infrared LEDs in the camera unit draw more current than the standard video circuit, and the parent unit's radio link also becomes voltage-sensitive under load. If the replacement battery shipped partially discharged, the system may drop below the IR activation threshold within minutes of startup. This is not a fault with the cell — it is a low state-of-charge issue. Charge the parent unit to 4.2V (full charge indicator) before first use and re-test night vision.