Shark V1720 Replacement Battery 4.8V 1500mAh Ni-MH

Shark V1720 / V1725 Series — 4.8V Ni-MH Replacement Battery (X9725H)

This is a 4.8V, 1500mAh Ni-MH replacement battery for the Shark V1720, V1725, and V1725H cordless handheld vacuums. It matches the OEM part number X9725H and slots into the same battery compartment as the original. Capacity is rated at 7.2Wh — identical to the factory spec.

• V1720, V1725, and V1725H compatibility: These three models share the same 4.8V battery rail, physical housing dimensions, and connector orientation. The X9725H battery part number covers all three, so no model-specific variant is needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a V1725H unit. The BMS accepted the charge handshake without fault, current draw tracked within expected range under motor load, and the low-voltage cutoff triggered at the correct threshold.
• Dock charging habit on these vacuums: Do not leave the V1720 or V1725 sitting on the charging dock between every use. These models use a basic trickle charger that does not cut off automatically when full. Charge to full, then remove the vacuum from the dock.

Cordless vacuum losing suction before the battery indicator reaches low

On the V1720 and V1725, suction can drop noticeably while the battery still reads adequate charge. This usually happens because a partially blocked filter forces the motor to work harder, drawing more current than the BMS expects under normal load. That elevated draw triggers a voltage sag at the cell level — suction weakens even though capacity remains. Clear the filter first, then recheck suction with a freshly charged battery.

Motor cutting out mid-use and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the vacuum picks up a blockage or runs against dense carpet pile, the motor draws a brief current spike that exceeds the BMS threshold. The BMS cuts power to protect the cell, then resets once current normalises. Check the suction path and filter for any restriction — once cleared, the motor should hold continuous power through a full charge cycle without tripping.