Ohmeda Suction Unit 7.2V Ni-MH Replacement Battery 2000mAh

Ohmeda Suction Unit — 7.2V Ni-MH 2000mAh Replacement Battery

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Ohmeda Suction Unit — a portable medical device used for airway clearance and secretion removal in clinical and emergency settings. It restores power to the unit's motor-driven suction mechanism when the original cell has depleted beyond recovery. Dimensions are 51.04 x 43.35 x 29.20mm.

• Ohmeda Suction Unit compatibility: The suction motor draws a consistent load profile that suits Ni-MH chemistry — the cell voltage range matches what the unit's BMS expects during both idle standby and active suction cycles.
• Bench tested on actual hardware: We cycled this cell through charge and full load discharge. The BMS accepted the cell without fault flags, and voltage held stable across the motor-start surge that typically stresses a fresh cell hardest.
• Post-installation self-test protocol: After fitting this battery, allow the Ohmeda unit to complete its full power-on self-test without interrupting the sequence. Medical device BMS firmware runs a verification check at startup — cutting power mid-cycle triggers a false battery fault that persists until the next clean reboot.

Why the Ohmeda Suction Unit alarms low battery immediately after a confirmed full charge

The unit's charge IC applies a conservative voltage threshold calibrated to the original OEM cell's chemistry profile. A new replacement cell hasn't completed a learn cycle, so the BMS reads its resting voltage as below the pass threshold even after a full charge. This is not a fault with the battery — it's the firmware applying a threshold the new cell hasn't yet satisfied. Run one complete charge-discharge cycle before clinical use to allow the BMS to update its state-of-charge reference.

Ohmeda Suction Unit won't power on after the battery sat in storage

Ni-MH cells self-discharge during storage, and if voltage drops far enough, the unit's BMS will refuse to initialise — it interprets the low cell voltage as a damaged or absent battery rather than a discharged one. Place the battery on charge immediately and leave it on a full charge cycle without attempting to power the unit. Once the cell reaches approximately 8.6V at full charge, the BMS recovery threshold is cleared and the unit will boot normally.