Nellcor Bedside SPO2 X 1 Compatible Battery 11.1V 2500mAh

Nellcor Bedside SPO2 X 1 — 11.1V Li-ion Replacement Battery

This is an 11.1V, 2500mAh (27.75Wh) Li-ion replacement battery for the Nellcor Bedside SPO2 X 1 and Bedside SpO Patient Monitoring device. These bedside pulse oximeters are used in hospitals and clinical settings to continuously track patient oxygen saturation. When the original cell degrades, this replacement restores the internal backup power that keeps the monitor running during mains interruptions.

• Bedside SPO2 X 1 and Patient Monitoring compatibility: Both fit models share the same 11.1V three-cell Li-ion configuration, connector pinout, and BMS handshake protocol. The charge IC in the device expects this voltage rail at startup — substituting a lower-voltage pack triggers an immediate fault flag.
• Bench tested on actual hardware: We cycled this battery through charge and load on the Bedside SPO2 platform. The BMS completed cell-balance verification and accepted the pack without fault codes after a single full charge-discharge cycle.
• Post-installation self-test protocol: After fitting this battery, allow the device to complete its full power-on self-test without interruption. Medical-grade BMS firmware runs a verification sweep at startup — cutting power mid-sequence writes a false battery fault that persists until the next clean reboot.

Device not completing boot sequence after battery swap

The Bedside SPO2 X 1 runs a multi-stage BMS verification during boot. A new cell that has partially self-discharged in storage may sit just below the threshold the firmware requires to proceed past the battery check stage. The device stalls or restarts in a loop — not because the battery is faulty, but because the charge IC has not yet profiled the new cell. Connect the device to mains power, allow a full uninterrupted charge to 100%, then reboot. The boot sequence should complete normally once cell voltage reaches 12.4V or above.

Low battery alarm triggering immediately after confirmed full charge

This is a known BMS behaviour on first installation, not a defective cell. The Nellcor device stores learned capacity data from the previous battery — when a new pack is fitted, the charge controller applies its most conservative capacity estimate until one full cycle recalibrates it. The alarm clears after a complete charge-to-discharge-to-charge cycle with the device powered on throughout. Do not skip this cycle before clinical use — the BMS learn sequence must complete for accurate low-battery thresholds to apply.