iBoto Smart Aqua X420GW 14.4V Replacement Battery 3400mAh

iBoto Smart Aqua X420GW Series — 14.4V Li-ion Replacement Battery

This 14.4V 3400mAh Li-ion battery replaces the original pack in the iBoto Smart Aqua X420GW, Smart C820W Aqua, and Smart L920SW Aqua robotic vacuums. All three models run the same 14.4V power rail with a matched connector and BMS profile. Capacity is 3400mAh (48.96Wh), sourced to match the factory specification.

• X420GW, C820W Aqua, L920SW Aqua compatibility: These three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. Swapping between them does not require any firmware change or adapter — the pack seats and communicates the same way across all three.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a matched iBoto platform. The BMS held the correct cutoff thresholds at both the high and low voltage limits, and the charger handshake completed without fault codes.
• Dock charging habit on these robots: Do not leave the robot sitting on the charging dock continuously between uses. These iBoto models use a trickle-top-off circuit that accelerates cell degradation when the pack is held at full charge indefinitely. Charge to full, then remove from dock until the next scheduled clean.

Suction dropping on the X420GW before the battery indicator shows low

The X420GW uses suction motor load as a proxy for floor type, but a partially blocked filter forces the motor to draw current above its rated band. The BMS reads this as a voltage sag event and reduces power delivery to protect the cells, which the user experiences as a suction drop — not a low battery. The indicator stays green because cell voltage hasn't hit the low threshold yet. Clean the filter first; if suction restores at the same charge level, the battery is not the cause.

Robot cuts out mid-cycle and restarts after sitting for a few seconds

This is a BMS overcurrent trip, not a cell failure. When the suction path is restricted — blocked brush roll, clogged inlet, or a saturated wet-cleaning pad — motor current spikes sharply. The BMS trips the output to protect the cells, the robot stops, and once the BMS resets internally the unit powers back on. Clear the restriction completely, then check that resting pack voltage is above 12.0V before concluding the battery is at fault.