Ultenic D5s Pro Stick Vacuum Replacement Battery 14.4V 3350mAh

Ultenic D5s Pro — 14.4V Li-ion Replacement Battery

This is a 14.4V, 3350mAh (48.24Wh) Li-ion replacement battery for the Ultenic D5s Pro cordless stick vacuum. It replaces the original pack when capacity has faded and the vacuum no longer holds a useful charge. Fits the D5s Pro only — verify your model before ordering.

• D5s Pro fit: The D5s Pro runs a 14.4V architecture with a specific connector and BMS handshake. This pack matches that voltage rail and connector geometry. Other Ultenic models may share similar housings but use different cell configurations — do not assume cross-compatibility.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the D5s Pro motor platform. The BMS held cutoff correctly at low-voltage threshold and accepted charge without fault codes from the stock charger.
• Dock charging habit on the D5s Pro: The D5s Pro dock does not cut power when the battery reaches full — it continues to trickle charge. Leaving the vacuum on the dock permanently accelerates capacity fade. Charge fully, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the cell can sustain at its present state of charge. A partially blocked filter forces the motor to work harder, pulling current beyond the battery's rated output at mid-charge. The BMS responds by throttling current before the indicator registers low, so suction drops while the gauge still shows charge remaining. Clean or replace the filter first — if suction holds longer after that, the battery was not the primary cause.

Motor cutting out mid-run and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, clogged brush roll, or a sealed nozzle — the motor draws a sustained spike of current. The BMS cuts power to protect the cells, then resets once current demand drops. The recovery feels like the vacuum restarting on its own. Clear the blockage, check the filter, then run the vacuum again — if the cutout stops, the cause was restriction, not the battery.