Black+Decker HNV215B Replacement Battery 7.4V 2500mAh

Black+Decker HNV215B Series — 7.4V Li-ion Replacement Battery (EPP72L15D)

This is a 7.4V, 2500mAh Li-ion replacement battery for the Black+Decker HNV215B and HNV215B12 cordless handheld vacuums. It slots into the same bay as the original EPP72L15D pack and restores full motor voltage to the unit. Capacity is 2500mAh — matching the factory spec.

• HNV215B and HNV215B12 compatibility: Both models run the same 7.4V two-cell Li-ion architecture with an identical connector and BMS communication protocol. One battery covers both variants without modification.
• Bench tested on actual hardware: We cycled this pack through the HNV215B motor draw under full suction load. The BMS held the voltage rail steady across sustained use and tripped correctly when we simulated a blocked filter causing overcurrent — then reset cleanly once cleared.
• Dock charging discipline for HNV215B users: The HNV215B charging dock does not terminate charge and switch to a true maintenance mode — it continues to trickle once full. Remove the battery or vacuum from the dock once the charge indicator clears. Leaving it docked permanently accelerates cell degradation faster than normal use cycles.

Suction dropping before the battery indicator reaches low

The HNV215B motor pulls significantly more current when the filter is partially blocked or the dustbin is near capacity. That elevated draw causes voltage to sag under load even when the battery still reads as charged. The BMS reads this as a safe operating state — the indicator stays green — but available motor power drops noticeably. Clean the filter and empty the bin first; if suction restores immediately, the battery is not the issue.

Motor cuts out mid-use and then recovers after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the vacuum's airpath is restricted — blocked nozzle, saturated filter, or hair wrapped around the intake — the motor strains against the restriction and current draw spikes past the BMS threshold. The BMS shuts output off briefly to protect the cells, then resets once current normalises. Clear the blockage completely and confirm the filter is dry before resuming use. If the trip keeps happening on a clear airpath, check that the battery contact pins on the vacuum are clean and seating fully.