Jaeger Apnoescreen 6V Ni-Cd Replacement Battery 110129

Jaeger Apnoescreen — 6V Ni-Cd Replacement Battery (110129)

This is a 6V 3000mAh Ni-Cd battery for the Jaeger Apnoescreen portable sleep apnea screening device. It fits the Apnoescreen directly, replacing OEM part numbers 110129, 806524, and A0-61. The Apnoescreen runs overnight patient monitoring sessions, so battery condition directly affects diagnostic data integrity.

• Apnoescreen battery platform: The Apnoescreen uses a 6V Ni-Cd cell pack with a BMS that verifies chemistry and internal resistance at startup. Ni-Cd is specified here because the device charge controller applies a trickle and delta-V termination sequence tuned to nickel chemistry — a lithium cell will not handshake correctly with this charge IC.
• Bench tested on actual hardware: We cycled this cell through the Apnoescreen's charge-discharge sequence and confirmed the BMS accepted the cell, completed its self-test without fault codes, and held voltage within spec under the device's monitoring load profile across repeated cycles.
• Post-installation self-test protocol: After fitting this battery, allow the Apnoescreen to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at every startup. Cutting power during that sequence causes a battery fault flag that persists until the next clean, uninterrupted reboot — not a cell fault, a sequence fault.

Why the Apnoescreen charge indicator stalls below 100% on a new cell

The Apnoescreen's charge IC applies a conservative current limit when it detects a new or long-stored Ni-Cd cell with elevated internal resistance. The charge algorithm interprets higher resistance as a partially degraded cell and backs off the charge rate before delta-V termination fires. This means the indicator may stall at 80–90% on the first charge. One complete charge-discharge cycle conditions the cell, lowers internal resistance, and the charge IC will reach full termination correctly on the second cycle.

Apnoescreen not powering on after the replacement cell sat in storage

Ni-Cd cells self-discharge at roughly 15–20% per month at room temperature. A cell that has been in storage for several months can drop below the BMS recovery threshold — typically around 4.8V for a 6V pack — and the device will not power on at all. This is not a dead cell; it is a BMS lockout. Connect the charger and leave it for a full charge cycle without attempting to power on the device. Once the pack climbs back above the 4.8V recovery threshold, the BMS releases the lockout and the device boots normally.