Datex Ohmeda S/5 Patient Monitor Compatible Battery 12V 3800mAh

Datex Ohmeda S/5 Patient Monitor — 12V Ni-MH Replacement Battery (17014)

This 12V 3800mAh Ni-MH battery is a direct replacement for the Datex Ohmeda S/5 Patient Monitor. It fits the portable vital signs monitor used in clinical environments to track heart rate, SpO2, blood pressure, and temperature. Voltage and capacity match the original specification at 12V and 45.6Wh.

• S/5 Monitor platform compatibility: The S/5 series runs a 12V battery rail with a BMS that verifies cell chemistry at startup. Ni-MH chemistry is the correct match for the BMS handshake on this platform — substituting Li-ion chemistry here will cause an immediate fault code.
• Bench tested on actual hardware: We cycled this battery through the S/5 power-on self-test sequence. The BMS accepted the cell stack without fault on the first boot after one full charge cycle. Charge acceptance and voltage hold were consistent with original battery behaviour.
• Startup sequence after installation: After fitting this battery, allow the S/5 to complete its full power-on self-test without interruption. The device runs BMS verification at startup, and cutting power mid-sequence triggers a false battery fault that persists until the next complete reboot cycle.

S/5 alarming low battery immediately after a confirmed full charge

The S/5 BMS uses a learned voltage threshold calibrated to the original cell's charge profile. A new Ni-MH cell has a slightly different charge curve on the first cycle, which the BMS may read as below its minimum threshold. This is not a fault with the battery. Run one complete charge-discharge-recharge cycle, and the BMS recalibrates its internal threshold to the new cell. The alarm clears once resting voltage holds above 12.0V on a full charge.

S/5 not powering on after battery sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A battery stored for several months can drop below the S/5 BMS recovery threshold — typically around 10.8V — and the device will not initiate boot. Connect the monitor to mains power first and allow the charge circuit to pre-condition the battery for at least 30 minutes before attempting to power on from battery alone. If the charge indicator does not advance past the first bar within that window, check that mains supply voltage is within the device's rated input range before assuming battery fault.