Spacelabs Qube 91390 Patient Monitor Replacement Battery 11.1V

Spacelabs Qube 91390 Patient Monitor — 11.1V Li-ion Replacement Battery (GPDR204)

This 11.1V, 7800mAh Li-ion battery replaces the OEM pack in the Spacelabs Qube 91390 patient monitor. The Qube 91390 is a portable clinical monitor used to track heart rate, blood pressure, and oxygen saturation at the bedside or during patient transport. Cross-references include GPDR204, NI2040, NI2040A22, NI2040HD24, SM204, and NI2040-SL29, among others.

• Qube 91390 platform fit: These OEM part numbers — GPDR204, NI2040, and their suffix variants — all share the same 11.1V three-cell configuration, connector pinout, and BMS handshake protocol. The Qube 91390's charge circuit communicates with the pack's protection board before accepting a charge, so the cell chemistry and communication lines must match exactly.
• Bench tested on actual hardware: We ran this pack through the Qube 91390's startup and charge acceptance sequence. The BMS handshake completed without fault codes, the charge IC accepted the full 7800mAh cycle, and the protection board tripped correctly at both high-current draw and low-voltage cutoff thresholds.
• First-use initialisation on medical hardware: After installing this battery, allow the Qube 91390 to complete its full power-on self-test without interruption. The device's BMS verification runs at startup — cutting power during this sequence logs a persistent battery fault that will not clear until the next complete reboot cycle.

Charge indicator stalling below 100% on the first cycle

On new Li-ion cells, the Qube 91390's charge IC applies a conservative current limit during the first charge cycle. This is not a fault — the charge controller is calibrating to the new cell's internal resistance profile. The indicator may stall anywhere between 85% and 97% and then jump to full, or it may report full charge at a lower apparent level. Run one complete charge-discharge cycle and the charge IC will recalibrate. After that first cycle, the display should track accurately from 0% to 100%.

Qube 91390 alarming low battery immediately after a confirmed full charge

This alarm fires when the BMS's state-of-health threshold is set against OEM cell parameters and the new pack hasn't completed a learn cycle yet. The monitor's BMS compares resting voltage and internal resistance against stored OEM baseline values — a new cell reads slightly outside that window until one full charge-discharge pass recalibrates the threshold. Connect the monitor to mains, allow it to charge to full, use it on battery until it requests charge, then recharge fully. After that one cycle, the low-battery alarm threshold should align to the new pack and clear at or above 11.4V resting.