LG A902RM Cordless Vacuum Compatible Battery 25.55V 2000mAh

LG Cord Zero A9 Series — 25.55V Li-ion Replacement Battery (MEV65921201)

This is a 25.55V, 2000mAh (51.1Wh) lithium-ion battery for the LG Cord Zero A9 range of cordless stick vacuums, including the A902RM, A929KVM, and A9M. It replaces OEM part numbers MEV65921201, EAC63758601, EAC63382201, and EAC63382202. When the original pack no longer holds charge after extended use, this cell restores the vacuum to working condition.

• A9 Series compatibility: The Cord Zero A9 platform runs a single 25.55V battery architecture across its variants. These models share the same connector, voltage rail, and BMS handshake requirements, which is why one cell covers the full A902RM, A929KVM, and A9M lineup.
• Bench tested on actual hardware: We ran this battery through charge cycles on A9 platform hardware. The BMS balanced cells correctly, accepted a full charge without error codes, and held voltage under sustained motor load without tripping overcurrent protection.
• Dock charging behaviour on A9 vacuums: Do not leave the vacuum sitting on the wall dock permanently. Continuous dock charging on this platform causes capacity fade significantly faster than charge-and-remove use. Charge to full, then pull the vacuum from the dock.

Suction dropping before the battery indicator reaches low

On the Cord Zero A9, suction loss often happens well before the battery LED signals low charge. The motor draws higher current when the filter is partially blocked, which causes voltage to sag under load even though the cell still shows charge. The BMS reads that sag as a protection condition and throttles power to the motor. Check and clean the filter first — if suction recovers, the battery is not the cause.

Motor cuts out mid-clean then comes back after a pause

This is a BMS overcurrent trip, not a dead cell. Restricted airflow — from a clogged filter or blocked floorhead — forces the motor to pull more current than the BMS allows on a sustained draw. The pack shuts the output, cools briefly, then resets. Clear the blockage and check the filter is seated correctly. If the trip still fires on an unobstructed run, measure resting voltage after the trip — a healthy pack should read above 22V.