ETA 2228 Navaggio Compatible Battery 14.4V 3200mAh Li-ion

My ETA 2228 Navaggio won't charge at all on the new replacement battery — the dock light doesn't come on. What's wrong?

The Navaggio charger expects a BMS handshake before it starts delivering current — if the replacement cell's BMS is in a deep-discharge lock state, the charger sees no response and stays dark. Try connecting the vacuum directly to the charger for 10–15 minutes without using the dock cradle, as the cradle contacts sometimes don't seat firmly enough to initiate the handshake. If the charger light still doesn't respond, check that the battery contacts on the vacuum body are clean and making firm contact. A resting cell voltage below 10V on a 14.4V Li-ion pack means the BMS has locked out — at that point the cell needs a compatible Li-ion recovery charger to bring it above the re-initialisation threshold.

The battery fades noticeably faster than the original after just a few months of use — why?

The most common cause is continuous dock charging. The Navaggio's dock keeps a trickle current flowing after the pack reaches full charge, and that sustained trickle degrades cell capacity faster than regular charge-discharge cycles. Remove the vacuum from the dock once charging is complete rather than leaving it docked between every use. If the runtime was short from the first charge, run two full discharge-and-recharge cycles to let the BMS calibrate — a cell that has never been fully cycled often reads capacity incorrectly on the first few uses.

The Navaggio motor cuts out the moment I press onto thick carpet, then restarts on its own — is that a battery fault?

That cutout is the BMS tripping on a current surge, not a weak cell. Pressing into thick carpet increases resistance against the brush roll and nozzle, which forces the motor to draw a short spike of current above the BMS overcurrent threshold. The BMS shuts power off to protect the cell, then resets within seconds once current drops. Check the brush roll for hair wrap and confirm the filter is clean and seated — both increase motor load and make the surge worse. Once the airflow restriction is cleared, the overcurrent trips will stop.