Tesvor M1 Replacement Battery 14.4V 2600mAh SUN-INTE-172

Tesvor M1 / S3 / S4 / S6 Turbo Series — 14.4V Li-ion Replacement Battery (SUN-INTE-172)

This is a 14.4V 2600mAh Li-ion battery for the Tesvor robotic vacuum range. It fits the M1, S3, S4, and S6 Turbo, along with 13 additional models sharing the same battery bay and connector format. Swap it in when the original cell no longer holds enough charge to complete a full cleaning cycle.

• M1, S3, S4 and S6 Turbo compatibility: These models run on the same 14.4V platform and use an identical connector and BMS handshake. One battery covers all of them because Tesvor standardised the cell format and communication protocol across this generation of robot vacuums.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the M1 dock. The BMS negotiated correctly with the charger, protection circuits tripped cleanly at undervoltage, and the cell delivered consistent output voltage through the discharge curve without early cutoff.
• Dock charging discipline for robot vacuums: Do not leave the Tesvor on its dock permanently. Robot vacuums that return to the dock after every run and stay connected indefinitely develop capacity fade faster than those charged only when depleted. Charge to full, then remove from the dock or power the dock off until the next scheduled run.

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 draws more current than rated to maintain suction. That elevated draw causes cell voltage to sag under load, and the BMS reads it as a low-voltage condition even though the battery still has charge remaining. Clean or replace the filter first — if suction stabilises and the indicator stops dropping early, the filter was the cause, not the battery.

Motor cuts out mid-run and then recovers after a short pause

This is a BMS overcurrent trip. Sustained restricted airflow — from a blocked filter, tangled brush roll, or carpet fibres packed into the inlet — forces the motor to draw current beyond the BMS protection threshold. The BMS shuts the cell output down to protect the pack. After a short recovery period the BMS resets and the motor runs again. Clear the blockage, check the brush roll for wrapped debris, and confirm the filter is clean. If the cut-out stops after clearing, no battery fault exists.