Tesla RoboStar iQ300 Replacement Battery 14.4V 2600mAh

Tesla RoboStar iQ300 — 14.4V Li-ion Replacement Battery

This 14.4V 2600mAh lithium-ion battery is a direct replacement for the Tesla RoboStar iQ300 robotic vacuum cleaner. It fits the iQ300's battery bay and connects to the existing motor controller and BMS communication lines. Capacity is 2600mAh (37.44Wh) — matching the original specification.

• RoboStar iQ300 platform fit: The iQ300 uses a fixed 14.4V cell block with a specific connector orientation and BMS handshake. This replacement matches that voltage rail and connector, allowing the robot's controller to read cell state correctly and run the cleaning cycle without error flags.
• Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the iQ300 platform. The BMS communicated cleanly with the vacuum's controller — no low-battery cut-off triggered prematurely, and the cell block held voltage under sustained motor load across multiple passes.
• Dock charging behaviour on the iQ300: Do not leave the iQ300 sitting on its charging dock permanently between uses. Continuous trickle charging accelerates capacity fade in Li-ion cells. Charge the battery to full, then remove the unit from the dock until the next cleaning cycle.

Suction dropping before the battery indicator reaches low on the iQ300

The iQ300 motor draws significantly more current when airflow is restricted — a partially blocked filter or tangled brush roll forces the motor to work harder, pulling amps the aging cell block can no longer sustain at full voltage. The result is suction loss that looks like battery failure but is actually voltage sag under elevated load. A new battery will restore voltage headroom, but the symptom returns quickly if the filter stays clogged. Clean or replace the filter before installing the new cell, then recharge fully to 16.8V before the first run.

Motor cuts out mid-cycle then recovers after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the brush roll is obstructed — hair wrap, carpet fringe, debris — current draw spikes above the BMS protection threshold and the cell shuts output to prevent damage. After a few seconds the BMS resets and power returns. The cycle repeats until the obstruction is cleared. Turn the iQ300 over, remove any wrap from the brush roll, then confirm the filter is clear before resuming — the BMS trip threshold on a fresh cell is harder to hit with unrestricted airflow.