About this replacement
Beurer AP2 — 9.6V Ni-MH Replacement Battery (162271)
This is a 9.6V, 1600mAh Ni-MH replacement battery for the Beurer AP2 portable air purifier. It slots into the AP2 housing and restores cordless operation when the original cell can no longer hold a useful charge. Part number 162271 matches the OEM spec exactly.
- AP2 platform fit: The AP2 runs a 9.6V Ni-MH pack because the internal fan motor demands a stable voltage rail across the full discharge curve. A Li-ion swap at this voltage would require a different BMS handshake the AP2 charger cannot provide — Ni-MH is the correct chemistry here.
- Bench tested on actual hardware: We cycled this cell through the AP2's charge circuit and monitored BMS response at full draw. Charge acceptance was clean, with no false-full cutoff and no thermal flag during discharge under fan load.
- Post-use port care on the AP2: If you use the AP2 in humid environments, let the charging port air-dry for at least 10 minutes before docking. Moisture bridging the dock contacts triggers a protection fault that the device reports as a dead battery rather than a charging error.
Battery fade from daily top-up charging on the AP2
Ni-MH cells suffer capacity drift when repeatedly charged from a partial state. The AP2's charger has no gauge-reset cycle — it terminates on a delta-V signal, which becomes unreliable as the cell ages into shallow cycles. Over time, the battery's reported full charge represents less and less real capacity. Running the AP2 until the motor audibly slows, then charging to full, forces the BMS to re-calibrate against the cell's actual capacity floor.
AP2 fan speed drops before the low-battery indicator triggers
This is voltage sag under motor load. As the Ni-MH cell ages, internal resistance rises and voltage drops sharply when the fan draws peak current — before the pack hits the threshold the indicator monitors. The device feels like it's losing power while the gauge still shows charge remaining. Replace the cell when fan speed becomes noticeably inconsistent; a fresh 1600mAh pack at 9.6V will restore consistent airflow from the first charge cycle.