ETA 1230 Aquamaster Replacement Battery 22.2V 2500mAh

ETA 1230 Aquamaster — 22.2V Li-ion Replacement Battery (61SR18650-2200)

This 22.2V 2500mAh lithium-ion battery replaces the original pack in the ETA 1230 Aquamaster wet-dry cordless vacuum. It fits both the 1230 Aquamaster and Aquamaster 1230 variants. Capacity is rated at 55.5Wh and matches OEM part numbers 61SR18650-2200, 6ICNMR19-66, 6IRS18650, and 6ISR18650-2500.

• 1230 Aquamaster platform fit: The Aquamaster 1230 runs a 22.2V six-cell lithium-ion architecture. Both model name variants share the same connector pinout and BMS handshake protocol, so one pack covers both.
• Bench tested on actual hardware: We ran this pack under simulated vacuum motor load at 22.2V nominal. The BMS held stable through sustained draw and tripped correctly on overcurrent — no false cutoffs during normal suction cycles.
• Dock charging habit on the Aquamaster: Do not leave the Aquamaster sitting on the charging dock after the pack is full. Continuous trickle current from the dock compresses cell capacity faster than normal charge cycles. Charge to full, then remove it.

Suction dropping before the battery indicator reaches low on the Aquamaster 1230

The Aquamaster's motor controller monitors cell voltage under load, not at rest. When the filter is partially blocked, the motor draws higher current to maintain suction — this pulls cell voltage down faster than the indicator predicts. The indicator reads resting voltage between draw cycles, so it still shows a full or mid charge while the cells are already sagging under load. Clean or replace the filter first before assuming the battery is at fault.

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

This is a BMS overcurrent trip, not a dead battery. Restricted airflow — from a clogged filter or a blockage in the hose — forces the motor to pull current above the BMS cutoff threshold. The BMS disconnects the pack to protect the cells, then resets once current demand drops. Clear the blockage and check the filter. If the cutout persists on a clean filter, check that resting voltage is above 20V before each use.