Bralko Galaxy II 14.4V Ni-MH Replacement Battery 3500mAh

Bralko Galaxy II — 14.4V Ni-MH 3500mAh Replacement Battery

This is a 14.4V, 3500mAh Ni-MH replacement battery for the Bralko Galaxy II cordless vacuum cleaner. It fits directly into the Galaxy II battery bay and restores the vacuum's full operating power after the original cell has degraded. No OEM part number exists for this unit — compatibility is confirmed by voltage, chemistry, and physical dimensions.

• Galaxy II battery bay fit: The Galaxy II uses a 14.4V Ni-MH pack at a specific form factor — 90.06 x 69.53 x 45.45mm. This replacement matches those dimensions and the correct voltage rail. The motor controller expects 14.4V nominal; fitting a mismatched voltage cell will cause the unit to underperform or refuse to run.
• Bench tested on actual hardware: We cycled this cell through full charge and load discharge sequences on a vacuum motor bench. The BMS handled sustained draw without tripping, and capacity measured within 5% of the rated 3500mAh across three consecutive cycles.
• Dock charging discipline for Ni-MH cells: Do not leave the Galaxy II sitting on the charging dock permanently. Ni-MH chemistry suffers trickle charge damage much faster than lithium cells. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

This is one of the most misread failures on the Galaxy II. The indicator LED tracks voltage, but suction depends on the actual current the motor draws. A partially blocked filter forces the motor to work harder, pulling more current than the battery can sustain at full voltage. The pack voltage sags under that load even though the indicator still reads mid-range. Clear the filter first — if suction recovers, the battery is not the root cause.

Motor cutting out mid-run and then recovering after a pause

This is a BMS overcurrent trip, not a dead battery. When the Galaxy II motor encounters sustained restricted airflow — a clogged filter or blocked nozzle — current draw spikes past the protection threshold. The BMS cuts the output to protect the cell, then resets once current demand drops. The fix is to clear the restriction before blaming the battery. If the motor still trips on a clean filter with a fresh cell, check that the replacement cell voltage reads at least 14.4V off the charger before reinstalling.