Beurer BY77 Baby Monitor Compatible Battery 3.8V 2100mAh

Beurer BY77 — 3.8V Li-ion Replacement Battery (1ICP4/50/60-210AR)

This is a 3.8V 2100mAh Li-ion battery for the Beurer BY77 baby monitor parent unit. It replaces OEM part number 1ICP4/50/60-210AR and also fits the 952-62 variant of the same system. Capacity is sourced from product data at 7.98Wh.

• BY77 and 952-62 parent unit fit: Both the BY77 and 952-62 use the same parent unit hardware platform with an identical battery bay, connector pitch, and BMS handshake protocol — swapping between models requires no adapters.
• Bench tested on actual hardware: We ran this cell in the BY77 parent unit and confirmed the BMS accepted the charge cycle without fault codes, held the 3.8V nominal rail, and did not trip during screen-on night mode operation.
• Post-swap re-pairing: After fitting this battery, re-pair the parent unit with the camera unit manually. A full power loss clears the wireless link on the BY77 — the parent unit will not reconnect automatically after a battery swap.

BY77 parent unit battery draining overnight during monitoring

Night-time monitoring with the screen left on is a sustained draw on the BY77 parent unit — backlight, speaker standby, and the radio receiver all pull current simultaneously. A degraded original battery fails this load within a few hours. This replacement cell at 2100mAh restores the capacity needed for overnight monitoring sessions. Enable the screen timeout in the BY77 settings to reduce draw from the backlight during periods of no activity.

BY77 range drops noticeably after fitting a new battery

The BY77's radio transmitter is voltage-sensitive — reduced range after a battery swap usually means the cell hasn't reached its full charge yet. The parent unit's radio power output scales with available voltage, and a partially charged Li-ion cell won't deliver the full 3.8V nominal rail. Charge the parent unit to 100% before testing range. If range remains short at full charge, check that the camera unit is not obstructed and that both units are running current firmware.