Ultenic H18650CH-4S1P Cordless Vacuum Replacement Battery 14.4V 2600mAh

Ultenic H18650CH-4S1P — 14.4V Li-ion Replacement Battery (H18650CH-4S1P)

This is a 14.4V 2600mAh Li-ion battery for Ultenic cordless stick vacuums using OEM part number H18650CH-4S1P. It replaces the original cell pack when the existing battery no longer holds enough charge to complete a clean. Voltage and capacity match the stock specification — 14.4V, 2600mAh (37.44Wh).

• Ultenic stick vacuum platform: Ultenic cordless vacuums in this range share the H18650CH-4S1P cell pack format — same 14.4V rail, same connector pinout, and same BMS communication protocol. Swapping to this replacement restores the full voltage the motor needs to sustain suction across carpet and hard floor.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the bench. The BMS handled overcurrent trips correctly under simulated blockage loads and returned to normal operation without manual reset. Voltage at full charge held at the expected 16.8V before settling to nominal.
• Dock charging habit on Ultenic vacuums: Do not leave this vacuum sitting on the dock permanently. Continuous trickle charging accelerates capacity fade in Li-ion packs faster than normal charge-discharge cycling. Charge fully and remove from the dock — recharge again only when the indicator shows low.

Suction dropping before the battery indicator reaches low

This is a voltage sag issue, not a capacity issue. When the filter is partially blocked, the motor works harder and draws more current than the BMS is rated to sustain. Voltage at the motor terminals drops under that load, and suction weakens — even though the battery gauge still reads mid-range. Clean or replace the filter first. If suction recovers, the battery was not the fault. If sag continues with a clean filter on a fresh charge, the cell pack has degraded and the replacement pack will fix it.

Motor cuts out mid-clean and then restarts after a pause

This is a BMS overcurrent trip. When suction is restricted — blocked filter, clogged brush head, or a hard carpet snag — current draw spikes above the BMS cutoff threshold and the pack shuts the motor off to protect the cells. A short pause lets the BMS reset and the motor restarts. Clearing the restriction stops the cycle. If cutouts continue on a clean, unobstructed floor, the original cell pack has degraded enough that even normal motor-start current is tripping the BMS — replace the pack and retest at 14.4V nominal.