Ultenic D6s 14.4V Replacement Battery GW002-A2-4S1P

Ultenic D6s — 14.4V Li-ion Replacement Battery (GW002-A2-4S1P)

This is a 14.4V 2600mAh Li-ion replacement battery for the Ultenic D6s cordless stick vacuum. It slots into the D6s battery compartment and uses the same GW002-A2-4S1P specification as the original cell. Capacity is rated at 37.44Wh — identical to factory spec.

• D6s platform fit: The D6s battery bay uses a fixed voltage rail and a specific connector orientation. This cell matches both, along with the BMS handshake the D6s motor controller expects before it will draw current. A mismatched BMS will cause the vacuum to appear dead even with a charged cell installed.
• Bench tested on actual hardware: We ran this cell through sustained suction cycles and monitored BMS response under both normal floor cleaning load and high-resistance carpet load. The BMS held voltage without tripping at rated draw, and cutoff triggered correctly at the low-voltage threshold.
• Dock charging habit on the D6s: Do not leave the D6s sitting on the charging dock permanently. Continuous trickle charging on this cell degrades capacity measurably faster than charging only when depleted. Charge to full, remove from the dock, and store the vacuum off charge.

Suction dropping before the battery indicator shows low

This is a voltage sag issue, not a capacity issue. When the D6s motor encounters resistance — a partially blocked filter, a dense rug, or a restricted inlet — it draws more current than the cell can deliver at stable voltage. The motor controller reads the resulting voltage dip as a low-battery condition and reduces power, even though the battery still holds charge. Clean the filter first. If the sag continues with a clean filter on a new cell, check the inlet path for partial blockages before assuming the battery is at fault.

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

This is a BMS overcurrent trip, not a dying battery. On the D6s, sustained restricted airflow forces the motor to pull above its rated current draw. The BMS detects the spike and shuts the cell down to protect it. After a few seconds the BMS resets and allows current flow again — which is why the vacuum "comes back." The fix is to clear the filter and check for blockages in the brush head or inlet tube. A clean airpath keeps motor draw within BMS limits, and the cutouts stop.