Electrolux OSBP72LI25 Cordless Vacuum Compatible Battery 7.2V 2000mAh

Electrolux 900257877 / ERV7210TG Series — 7.2V Li-ion Replacement Battery (OSBP72LI25)

This is a 7.2V, 2000mAh Li-ion battery for Electrolux cordless stick vacuums including the 900257877, ERV7210TG, ERV7200DB, and 900257983. It replaces OEM part OSBP72LI25 using the same voltage rail and connector layout. Capacity is 2000mAh (14.4Wh), matching the original specification.

• ERV7210TG and 900257877 compatibility: These models share the same 7.2V motor circuit, BMS handshake protocol, and physical connector. One battery cell configuration covers the full group — no adapters or wiring changes needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 900257877 unit. The BMS responded correctly to charge termination and triggered overcurrent cutoff at the expected threshold under a blocked-filter load.
• Dock charging on Electrolux stick vacs: Do not leave this vacuum sitting on the charging dock continuously. These units lack active dock management — the cell stays in a trickle-charge state when left docked, which accelerates capacity fade. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the BMS is comfortable sustaining — typically caused by a partially blocked filter or brush roll restriction, not a failing battery. The BMS reads elevated current draw as a near-discharge condition and begins throttling motor voltage before the cell is actually depleted. Clear the filter and brush roll first. If suction holds after that, the battery is fine — the motor was simply pulling above rated current due to the restriction.

Motor cuts out mid-use then recovers after a short pause

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, tangled brush roll, or a sealed floor nozzle — the motor spins harder and current spikes above the BMS cutoff threshold. The BMS shuts the cell output to protect the chemistry, which reads as the vacuum suddenly stopping. After 10–20 seconds the BMS resets and the unit powers back on. Fix the restriction, then check that the replacement cell voltage reads at least 7.4V on a multimeter after a full charge before dismissing the battery as the cause.