Maquet 10.8V Ni-MH Replacement Battery 2270244

Maquet Magnus OR Table Wireless Hand Control — 10.8V Ni-MH Replacement Battery (2270244)

This 10.8V, 700mAh Ni-MH battery is a direct replacement for the Maquet Magnus OR Table Wireless Hand Control. It fits the cordless unit surgeons use to adjust table position during live procedures. Part numbers 2270244, B11927, and LH070-3A44C9BR all reference this same cell configuration.

• Magnus Wireless Hand Control platform: The hand control runs a 10.8V Ni-MH pack because the BMS in this unit expects a specific cell chemistry and voltage curve. Swapping to Li-ion voids the self-test handshake and trips a persistent fault code. This replacement matches the OEM chemistry so the BMS negotiation completes normally at power-on.
• Bench tested on actual hardware: We cycled this pack through charge, load, and BMS verification on a matched test rig. The cell voltage held within OEM tolerance across the self-test window, and the BMS reported a clean pass with no fault flags.
• First-use self-test protocol: After installing this battery, let the hand control complete its full power-on self-test without pressing any buttons or cycling power. The BMS runs a chemistry verification at startup. Interrupting that sequence stores a false fault that clears only on the next full reboot — not on the next charge cycle.

Why the Magnus hand control alarms low battery immediately after a confirmed full charge

The BMS in the Magnus hand control stores a charge threshold map based on the previous cell's discharge history. A new cell doesn't match that stored profile, so the BMS flags the voltage curve as abnormal during the first self-test cycle. This is not a defective battery — it is the BMS applying a learned limit to an unknown cell. Run one full charge-to-discharge-to-charge cycle before clinical use. After that first cycle, the BMS recalibrates its threshold and the alarm clears.

Hand control will not power on after the replacement battery sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A pack stored for several months can drop below the BMS recovery threshold — typically around 9.0V for a 10.8V Ni-MH pack — which causes the controller to refuse to boot entirely. Place the battery on the charger and leave it connected for a full charge cycle even if the charge indicator doesn't move for the first 20–30 minutes. Once cell voltage climbs back above the recovery floor, the BMS re-initialises and normal boot resumes. Confirm voltage is above 10.0V before attempting to power the hand control.