Solac AA3400 Replacement Battery 14.4V 2000mAh Ni-MH

Solac AA3400 / XR210 Series — 14.4V Ni-MH Replacement Battery

This is a 14.4V 2000mAh Ni-MH battery for the Solac AA3400, Ecogenic AA3400, XR210, and XR210C cordless vacuum cleaners. It replaces the original cell when capacity has faded or the battery no longer holds a usable charge. Voltage and connector match the original pack — no modification needed.

• AA3400 and XR210 platform compatibility: Both the AA3400 and XR210 lines share the same 14.4V battery rail and connector housing. The BMS on these vacuums expects a Ni-MH cell — substituting Li-ion would trigger a constant protection cutoff on these chargers.
• Bench tested on actual hardware: We cycled this cell through full discharge and recharge on the AA3400 platform. The BMS accepted the pack without fault codes, and the motor drew current at the expected rate across carpet and hard floor modes.
• Dock charging protocol for Ni-MH cells: Do not leave the vacuum on the charging dock permanently. Solac cordless vacuums using Ni-MH chemistry develop capacity fade significantly faster under continuous trickle charge than units charged only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator shows low on the AA3400

Ni-MH cells show a relatively flat voltage curve during discharge, then drop off sharply near the end. On the AA3400, the indicator reads remaining charge from resting voltage, not under-load voltage. Under partial filter blockage or worn brush roll resistance, the motor draws above its rated current — the cell voltage sags under that load before the indicator catches up. Clean the filter first, then test suction under actual load. If suction recovers immediately after filter cleaning, the battery is not the cause.

Motor cuts out mid-use then restarts after a short pause

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, full dustbin, or a lodged obstruction — the motor works harder and pulls more current than the BMS allows. The protection circuit opens, cutting the motor, then resets after the cell temperature drops slightly. Clear the blockage, empty the bin, and confirm the filter is seated correctly. If the cutout continues on a fully clear airpath, measure resting cell voltage: it should read above 12.0V on a charged Ni-MH 14.4V pack.