Ultenic TS1 14.4V Replacement Battery CSF32-4S1P 2600mAh

Ultenic TS1 — 14.4V Li-ion Replacement Battery (CSF32-4S1P)

This 14.4V, 2600mAh Li-ion battery replaces the original pack in the Ultenic TS1 cordless stick vacuum. It fits directly into the TS1's battery housing and restores the vacuum's ability to power the motor at operating voltage. Capacity matches the original at 37.44Wh.

• TS1 platform fitment: The TS1 uses a 14.4V four-cell series configuration matched to this pack's 4S1P arrangement. The BMS inside this replacement communicates with the vacuum's charge circuit and motor controller at the same voltage rails as the factory unit.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a TS1 unit, confirmed BMS handshake with the charger, and verified the motor controller accepted the pack without fault codes or cutout events at rated load.
• Dock charging on the TS1: Do not leave the TS1 sitting on its charging dock between uses. Continuous dock charging on this vacuum's charge circuit applies a low-level trickle current that accelerates capacity fade in the 4S1P cell arrangement. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the TS1

The TS1's BMS monitors cell voltage under load, not at rest. When the filter is partially blocked, the motor draws more current than rated to maintain airflow. That elevated draw causes cell voltage to sag early, and the vacuum's controller reduces motor speed to protect the pack — which the user reads as suction loss, not a battery fault. Clean or replace the filter first. If suction recovers and holds, the battery was protecting itself correctly. If the problem persists on a clean filter, the cell capacity has degraded and replacement is the fix.

Motor cuts out mid-use then restarts after a few seconds

This is a BMS overcurrent trip, not a motor fault. It happens when sustained restricted suction — caused by a clogged filter, blockage in the brush head, or heavy carpet pile — forces the motor to draw current beyond the BMS's threshold. The BMS interrupts the circuit, waits for current demand to drop, then re-enables power. Clear any blockage in the nozzle and brush roll, and inspect the filter. If the cutout stops occurring, the restriction was the cause. If it continues on an unrestricted airway, check the pack's resting voltage — a healthy 14.4V pack should read 16.4V fully charged across the terminals.