About this replacement
Air Liquide T60 Respirator — 22.2V Li-ion Replacement Battery (120008-O)
This 22.2V, 3350mAh lithium-ion battery pack replaces the OEM power source in the Air Liquide T60 powered air-purifying respirator. The T60 is used across medical and industrial environments where continuous filtered airflow is critical. Connector, voltage rail, and BMS handshake match the original pack to the T60's power management system.
- T60 platform compatibility: The T60 respirator operates on a 22.2V six-cell Li-ion architecture with a BMS that authenticates pack chemistry at startup. This replacement matches that cell configuration and voltage threshold exactly, so the device completes its power-on self-test without flagging a pack mismatch.
- Bench tested on actual hardware: We ran this pack through the T60's startup sequence and load cycle. The BMS accepted the cell chemistry, self-test completed without fault codes, and the blower motor drew current within spec across the full discharge curve.
- Startup sequence care: After installing the battery, let the T60 complete its full power-on self-test without interruption. Medical-grade BMS verification runs at boot — cutting power mid-sequence triggers a persistent battery fault that won't clear until the next full reboot cycle.
T60 BMS learn cycle on a new cell
The T60's battery management system calibrates its state-of-charge model against the cell's actual capacity during the first full charge-discharge cycle. A new pack hasn't completed this calibration, so the BMS may report inaccurate charge levels or apply conservative current limits in the first few uses. Run one complete charge to full termination voltage, followed by a full discharge under normal device load, before putting the pack into clinical rotation. After that cycle, the BMS reads the cell accurately and capacity reporting stabilises.
T60 showing low battery alarm immediately after a confirmed full charge
This happens when the BMS compares resting cell voltage against an OEM-calibrated threshold and the new pack hasn't yet passed the learn cycle. The alarm fires because the BMS hasn't confirmed the cell can sustain load current above its minimum cutoff — not because the pack is actually flat. Run one full charge-discharge cycle outside of clinical use to complete BMS initialisation. After that cycle, resting voltage should read above 21V and the alarm will not trigger on a freshly charged pack.