ETA 1227 Zero Replacement Battery 14.4V 2600mAh Li-ion

ETA 1227 Zero — 14.4V Li-ion Replacement Battery (H18650CH-4S1P-AGX-8)

This is a 14.4V 2600mAh Li-ion battery pack for the ETA 1227 Zero cordless vacuum cleaner. It replaces OEM part numbers H18650CH-4S1P-AGX-8 and 122700070. Fits both the 1227 Zero and Zero 1227 variants.

• 1227 Zero and Zero 1227 compatibility: Both model designations share the same 14.4V power rail, connector format, and BMS handshake protocol — the physical pack and communication signals are identical across the range.
• Bench tested on actual hardware: We cycled this pack through repeated charge and discharge runs on a 14.4V load rig. The BMS held correct cutoff at low-cell thresholds and did not trip under normal motor start current.
• Dock charging habit on the 1227 Zero: Remove the vacuum from the charging dock once the pack reaches full charge. Leaving it docked continuously applies a low-level trickle current that accelerates capacity fade in 4S Li-ion packs like this one — charge only when depleted.

Cordless vacuum losing suction before the battery indicator reaches low

On the ETA 1227 Zero, suction drops noticeably even when the battery indicator still shows mid-charge. This is almost always voltage sag — not capacity loss. A partially blocked filter or full dust container forces the motor to draw more current than rated, which pulls the pack voltage down under load. The BMS reads that sag as a low-cell event and reduces output before the charge indicator catches up. Clear the filter and empty the container first; if suction returns immediately, the pack is fine.

Motor cuts out mid-clean and then recovers after a few seconds

This is a BMS overcurrent trip, not a faulty battery. When the 1227 Zero motor encounters sustained restricted airflow — blocked filter, jammed brush roll, or a tight carpet pile — current spikes past the BMS overcurrent threshold and it disconnects the pack to protect the cells. After a few seconds the BMS resets and power returns. The fix is mechanical: clean the filter, check the brush roll for hair wrap, and verify airflow is clear. If the cutout persists on a clean machine, measure resting pack voltage — it should read above 15.6V on a full charge.