25.9V Hoover ATN252LI Replacement Battery 2500mAh

Hoover ATN252LI 011 — 25.9V Li-ion Replacement Battery (48009737)

This 25.9V 2500mAh lithium-ion battery replaces the original Hoover part number 48009737. It fits the ATN252LI 011, ATN252LI011, ATV252LT 011, and ATV252LT011 cordless vacuums, along with eight additional compatible models. The cell pack matches the original voltage rail and connector configuration of the Hoover stick vacuum platform.

• ATN252LI and ATV252LT platform fit: These models share the same 25.9V seven-cell Li-ion architecture, battery housing, and BMS handshake protocol. A single cell pack services the full range without wiring modifications or connector adapters.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the ATN252LI platform. The BMS negotiated correctly with the Hoover charger, protection thresholds fired at expected cutoff voltages, and the motor draw remained stable under sustained carpet load.
• Dock charging habit on Hoover stick vacuums: Do not leave the vacuum sitting permanently on the charging dock between uses. Continuous trickle charge from the dock accelerates cell degradation on this platform. Charge to full, remove the battery or vacuum from the dock, and reconnect only when the pack needs replenishing.

Suction dropping before the battery indicator reaches low

On the ATN252LI platform, suction loss before a low-battery warning is almost always a motor voltage sag issue rather than a depleted pack. When the filter is partially blocked, the motor works harder to maintain airflow and draws more current than rated. The BMS interprets this sustained overcurrent as a failing pack and reduces output to protect the cells. Clean or replace the filter first — if suction recovers, the battery was never the problem.

Motor cutting out mid-clean and then recovering after a short pause

This is a BMS overcurrent trip, not a dead battery. The Hoover motor controller on this vacuum series pulls a brief high-current spike when suction is restricted — most often a blocked filter, a tangled brush roll, or a partial blockage in the hose. The BMS cuts power to protect the cells, then resets after the pack cools slightly. Clear the restriction first, then check that the pack resting voltage reads at or above 22V before ruling out a cell issue.