Bosch BHN24L 21.6V Cordless Vacuum Replacement Battery 2500mAh

Bosch BHN24L Series — 21.6V Li-ion Replacement Battery (801BPV216-01)

This 21.6V 2500mAh Li-ion battery fits the Bosch BHN24L cordless handheld vacuum and compatible Move Lithium 24V Max variants. It replaces OEM part 801BPV216-01 and 11051762 directly. The battery slots into the same bay and communicates with the vacuum's onboard electronics using the original BMS protocol.

• BHN24L and VXAS002V21 compatibility: These models share a common 21.6V nominal rail, connector pinout, and BMS handshake signal. The cell group configuration and communication lines are identical across the BHN24L, BHN24L/04, and Move Lithium 24V Max platforms, which is why one battery covers all of them.
• Bench tested on actual hardware: We cycled this battery through repeated suction loads on the BHN24L motor assembly. The BMS held steady voltage delivery under sustained draw and triggered overcurrent protection correctly when the airpath was intentionally blocked — no false trips under normal use.
• Dock charging habit on this vacuum: Do not leave the BHN24L sitting on its charging dock permanently. Continuous trickle charging degrades cell capacity faster than normal cycle use. Charge to full, remove from the dock, and return it only when the battery is depleted.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the cell can deliver at its present state of charge, causing voltage to sag under load even though the indicator still reads mid-range. A partially blocked filter is the most common trigger — restricted airflow forces the motor to work harder, pulling amps beyond the BMS's preferred delivery window. The BMS doesn't cut power entirely; it just can't sustain the voltage the motor needs for full suction. Clean or replace the filter first, then check whether the symptom persists — if it does, the cell capacity has degraded and a replacement battery will restore normal draw.

Motor cuts out mid-use then restarts after a few seconds

This is an overcurrent trip from the BMS, not a dead battery. When suction is sustained against a blockage — hair wrap around the brush, a sealed nozzle, or a clogged filter — current spikes above the BMS threshold and it shuts the output to protect the cells. After a short recovery window, the BMS resets and the motor restarts. Clear any blockage and inspect the filter before assuming the battery is at fault. If the cutout continues on an unobstructed vacuum, check cell voltage immediately after the trip — a resting reading below 19V suggests the pack has degraded and is sagging under load.