RoboJet RJD3A Robotic Vacuum Compatible Battery 14.8V 3400mAh

RoboJet RJD3A — 14.8V Li-ion Replacement Battery

This is a 14.8V 3400mAh Li-ion battery for the RoboJet RJD3A robotic vacuum cleaner. It powers the motor, brush system, and navigation electronics. Fits the RJD3A directly — voltage and connector match the original cell pack.

• RJD3A platform fit: The RJD3A runs a 14.8V four-cell series configuration to drive both the suction motor and the onboard navigation logic. Any replacement must match this voltage rail exactly — a lower voltage cell will starve the motor under carpet load and trigger premature low-battery shutdown.
• Bench tested on actual hardware: We cycled this battery through repeated motor-start loads and monitored BMS response. The protection circuit held within expected cutoff thresholds during sustained draw, and cell voltage balanced correctly across all four cells after full charge.
• Dock charging habit on the RJD3A: Do not leave the RJD3A sitting on its dock indefinitely between sessions. Continuous trickle current from the dock degrades cell capacity faster than normal cycling. Charge fully, then lift the unit off the dock until the next scheduled clean.

Cordless vacuum losing suction before the battery indicator reaches low

This happens when the motor draws more current than the BMS allows under restricted airflow — not because the battery is empty. A partially blocked filter forces the motor to work harder, spiking current draw until the BMS throttles output to protect the cells. The vacuum feels like it's losing charge, but the real cause is restriction. Clear the filter and check the dustbin before assuming the battery is the problem.

Motor cuts out mid-clean then recovers after a short pause

This is a BMS overcurrent trip, not a dead battery. The suction motor hits a blockage or sustained high-resistance surface — thick carpet, debris bridge at the inlet — and current spikes past the protection threshold. The BMS shuts output briefly, then resets once load drops. To confirm: check the brush roll for wrapped hair, clear the inlet, and clean the filter. If trips stop after clearing, the battery is functioning correctly — the BMS cutoff was doing its job.