About this replacement
ETA 3423 Verto II — 10.8V Li-ion Replacement Battery (ETA342300100)
This 10.8V 2500mAh lithium-ion battery replaces the original pack in the ETA 3423 Verto II cordless handheld vacuum. It fits models 3423 Verto II and ETA342390000. OEM part numbers ETA342300100 and ETA342300101 both cross to this cell.
- 3423 Verto II platform fit: Both OEM part numbers share the same 10.8V nominal rail, connector footprint, and BMS handshake protocol. The vacuum's motor controller reads the BMS signal on startup — a mismatch here causes the unit to refuse to run even with a charged cell.
- Bench tested on actual hardware: We ran this pack through charge cycles on the Verto II and confirmed the BMS handshake clears correctly on power-up. The protection circuit tripped at expected thresholds under sustained high-draw load, then reset cleanly.
- Dock charging behaviour: Do not leave the Verto II on the charging dock continuously. Cordless vacuums on permanent dock charge develop capacity fade significantly faster than those charged only when depleted. Charge to full, then remove from the dock.
Cordless vacuum losing suction before battery indicator reaches low
The Verto II motor draws more current when the filter is partially blocked — the motor works harder to pull the same airflow. That higher draw creates a voltage sag at the battery terminals. The BMS reads this sag as a low-cell condition and throttles output before the LED indicator catches up. Clean or replace the filter first; if suction restores, the battery is not the cause.
Motor cuts out mid-use then recovers after a short pause
This is a BMS overcurrent trip, not a depleted cell. When suction is restricted — blocked filter, sealed nozzle, or heavy carpet contact — the motor spikes current above the protection threshold. The BMS cuts output to protect the cells, then resets once current drops. Clear any blockage and check the filter before resuming use. If trips continue with a clean filter, measure resting pack voltage: a healthy cell at partial charge should read above 10.8V.