Electropan Ilife V3S Replacement Battery 11.1V 2600mAh

Electropan Ilife V3S — 11.1V Li-ion Replacement Battery (UR18650ZT-3S1P-S)

This 11.1V 2600mAh Li-ion battery replaces the original cell in the Ilife V3S robotic vacuum cleaner. It powers the drive motors, suction motor, and onboard navigation system. Dimensions are 70.00 × 37.50 × 35.50mm — confirm these against your existing pack before fitting.

• Ilife V3S compatibility: The V3S runs a 3S1P 18650 cell arrangement on an 11.1V nominal rail. This pack uses the same UR18650ZT cell configuration and connector pinout, so the vacuum's charge management circuit recognises it without modification.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge passes on the V3S platform. The BMS held cell balance across all three series cells and tripped overcurrent protection correctly when suction was blocked during sustained motor load.
• Dock charging discipline on the V3S: The V3S auto-returns to its dock and sits there indefinitely. Remove the battery or the whole unit from the dock once charging is complete. Continuous trickle charge from the dock accelerates capacity fade on 18650 cells faster than normal cycle wear.

Suction dropping before the battery indicator reaches low on the V3S

The V3S suction motor draws significantly more current when the filter is partially blocked. That elevated draw causes voltage sag across the 3S cell stack, and the BMS reads it as low charge even when cell capacity is still available. The vacuum reduces motor power to protect the pack, so suction drops while the indicator still shows a mid-range charge level. Clean or replace the filter first — if suction recovers fully after that, the battery is not the cause.

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

This is an overcurrent trip, not a dead battery. When the V3S hits a sustained blockage — dense carpet fringe, a thick debris cluster, or a restricted filter — motor current spikes past the BMS threshold and the protection circuit opens. The pack rests, internal temperature drops, and the BMS resets, which is why the vacuum restarts after a short pause. Clear the brush roll and check the filter before suspecting the battery. If it still trips on an open, clean floor, measure pack voltage under load — it should hold above 10.5V during normal operation.