iRobot Roomba 500 Replacement Battery 14.4V 2800mAh

iRobot Roomba 500 Series — 14.4V Ni-MH Replacement Battery (11702)

This is a 14.4V, 2800mAh Ni-MH replacement battery pack for the iRobot Roomba 500 series robotic vacuum. It fits the Roomba 500, 510, 530, 532, and more than 34 additional models in the same platform family. The pack slots directly into the underside battery bay and connects to the robot's power management circuit.

• Roomba 500 platform compatibility: Every model in the 500 series runs the same 14.4V power rail, uses the same bay geometry, and communicates with the same BMS handshake protocol — which is why one pack covers the full range without modification.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a Roomba 530. The BMS negotiated correctly with the onboard charger, cells balanced across the full charge window, and the pack accepted current at the expected rate without tripping the protection circuit.
• Dock charging habit for Ni-MH cells: Ni-MH chemistry degrades faster under continuous trickle charge than Li-ion does. Run the Roomba until it docks and completes a full charge cycle, then remove it from the dock — do not leave it sitting on the base between uses.

Suction dropping before the battery indicator reaches low

The Roomba 500's motor draws significantly more current when filters are partially blocked or brush rolls are tangled. A degraded Ni-MH pack cannot sustain voltage under that elevated load, so motor speed drops even though the battery indicator still reads mid-range. The indicator measures resting voltage, not voltage under load — so it lags behind what's actually happening. A fresh pack resolves this if the filter and brush roll are clean; if suction still drops after replacement, clean or replace the filter first.

Roomba stops mid-cycle and resumes after a short pause

This pattern is a BMS overcurrent trip — not a software fault. When the motor encounters sustained high resistance, such as thick carpet or a partially blocked suction path, current draw spikes and the protection circuit cuts the pack to prevent cell damage. The robot pauses, the BMS resets, and it resumes. Replacing a worn pack helps, but if the trip recurs on a new battery, check that the filter is clean and the brush roll turns freely before drawing any other conclusions.