About this replacement
Respironics 60 Monitor — 6V Ni-MH Replacement Battery (110579)
This is a 6V, 1800mAh Ni-MH replacement battery for the Respironics 60 Monitor and compatible Caradyne Criterion 40 series pulse oximetry devices. It cross-references OEM part numbers 110579, 11389, 6038, 8-100152-00, B11511, and OM11511. Verify your OEM part number against this list before fitting.
- Respironics 60 Monitor and Criterion 40 compatibility: These models share the same 6V power rail, connector format, and BMS handshake protocol. A single cell pack services all variants in the Criterion 40 family, including the Airway Pressure Monitor configuration, without modification.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on a Ni-MH compatible charge controller, confirmed the BMS accepted the cell chemistry without fault flags, and verified terminal voltage held above 5.4V under a sustained load profile consistent with oximetry sensor operation.
- Post-installation self-test procedure: After fitting this battery, allow the Respironics 60 Monitor to complete its full power-on self-test without interruption. Medical device BMS firmware runs a verification sequence at startup — cutting power mid-cycle registers a false battery fault that persists until the next clean reboot.
Why the Respironics 60 Monitor alarms low battery after a confirmed full charge
The device BMS stores a charge acceptance profile calibrated to the original OEM cell. A new replacement cell has a slightly different internal resistance signature on the first cycle, which the BMS interprets as insufficient charge rather than a new cell. This is not a fault with the battery. Run one complete charge-discharge cycle and the BMS recalibrates its threshold to match the new cell's actual capacity curve.
Respironics 60 Monitor not powering on after battery sat unused in storage
Ni-MH cells self-discharge at roughly 1–2% per day in storage. A cell that has sat uninstalled for several months can drop below the BMS recovery threshold — typically around 4.8V on a 6V pack — and the device will not boot. Place the pack on a compatible Ni-MH charger for a full charge cycle before attempting to power on the monitor. If the charger does not detect the cell, check terminal voltage with a multimeter; below 4.5V, the pack may require a trickle pre-charge before the main charge cycle can begin.