Shark V1925 Cordless Vacuum Replacement Battery 4.8V 3000mAh

Shark V1925 / XBV1925 — 4.8V Ni-MH Replacement Battery (VAC-V1925)

This is a 4.8V 3000mAh Ni-MH replacement battery for the Shark V1925 and XBV1925 cordless vacuum cleaners. It slots into the original battery compartment and restores cordless operation when the factory cell can no longer hold a useful charge. Capacity is sourced from product data at 14.4Wh — do not rely on third-party listings quoting different figures.

• V1925 and XBV1925 compatibility: Both models share the same 4.8V cell configuration, connector pinout, and BMS handshake. The VAC-V1925 part number covers both variants — no adapter or wiring change required.
• Bench tested on actual hardware: We cycled this cell through the V1925 charging circuit and confirmed the BMS accepts charge, communicates state-of-charge correctly to the indicator, and cuts off at full without overcharging the Ni-MH cells.
• Dock charging discipline on the V1925: Leave this vacuum on the dock only until the charge indicator shows full, then remove it. Ni-MH cells in low-voltage cordless vacuums accumulate trickle-charge damage faster than Li-ion packs — continuous dock sitting is the single biggest cause of early capacity fade on this model.

Suction dropping before the battery indicator reaches low on the V1925

The V1925 motor draws more current the moment airflow is restricted — a partially blocked filter or tangled brush roll forces higher amp draw at the same voltage. Ni-MH cells respond to that extra load with voltage sag, which the motor controller reads as a low-battery condition even when the cell still holds significant charge. The suction drops not because the battery is depleted but because the cell voltage has sagged below the motor controller's operating threshold under load. Clean the filter and clear the brush roll before assuming the battery is the cause.

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

This is a BMS overcurrent trip, not a dead battery. When sustained suction restriction forces the motor to pull more current than the BMS threshold allows, the BMS disconnects the cell to protect it — the vacuum goes silent, then recovers once the BMS resets after a few seconds. If this happens repeatedly, the battery is not the fault. Check the filter for blockage first; a clean filter drops motor draw back within the BMS's rated window. If the cutout continues with a clean filter, measure resting cell voltage — a healthy Ni-MH pack at full charge sits at approximately 5.7–6.0V across all cells combined.