Siemens SC6002XL Patient Monitor 14.4V Replacement Battery AS36059

Siemens SC6002XL / Dräger MS14490 — 14.4V Li-ion Replacement Battery (AS36059)

This 14.4V, 4400mAh (63.36Wh) lithium-ion battery replaces the AS36059 cell pack in the Siemens SC6002XL and SC7000 multi-parameter patient monitors, as well as Dräger MS14490 and MS1423 units. It fits the same physical bay, connector, and BMS handshake across all listed models. Capacity is sourced from the product data — do not rely on aftermarket listings that quote differing figures.

• SC6002XL / SC7000 / Dräger MS14490 platform: These monitors share a common 14.4V battery architecture and the same locking connector format. The BMS on each model reads cell chemistry and voltage signature at power-on. A cell that meets the OEM voltage range and reports the correct chemistry tag clears the hardware check without error flags.
• Bench tested on actual hardware: We cycled this battery through charge, full load discharge, and charge again on compatible monitor hardware. The BMS accepted the cell on first insertion, the charge IC brought it to 14.4V without fault codes, and the capacity register updated correctly after one full cycle.
• Power-on self-test after installation: After fitting this battery, let the monitor complete its startup self-test without interruption. Medical device BMS firmware runs a verification routine at boot — cutting power mid-sequence writes a false battery fault to memory that will persist until the device completes a clean reboot from full charge.

SC6002XL not completing boot sequence after battery swap

The SC6002XL runs a hardware self-test during every cold boot. If the battery voltage sits below approximately 13.2V at power-on — common after storage — the monitor may halt mid-sequence or display a battery fault and refuse to proceed. This is not a faulty battery. The cell simply needs to reach a charge level the BMS considers safe for clinical operation before the boot logic will advance. Connect the monitor to mains power, allow the charge IC to bring the battery above 13.5V, then power cycle from a full charge state.

Low battery alarm triggers immediately after a confirmed full charge

The SC6002XL's BMS sets its low-battery alarm threshold against a learned capacity baseline stored from previous cycles. On a new cell, that baseline has not been written yet — the BMS has no reference point and can misread state-of-charge, triggering the alarm even at high voltage. Run one complete charge-to-discharge-to-charge cycle outside clinical use to allow the BMS to write a valid capacity baseline. After that cycle, the alarm threshold calibrates to the actual cell capacity and the false trigger stops.