Shark UV617 Replacement Battery 8.4V 1500mAh Ni-MH XBP617

Shark UV617 / UV647 Series — 8.4V Ni-MH Replacement Battery (XBP617)

This is an 8.4V, 1500mAh Ni-MH replacement battery for the Shark UV617 handheld UV sanitizing vacuum and related models including the UV647H, UV647, and V1730. It powers both the motor and the onboard UV sanitizing light. The OEM part numbers this cell replaces include XBP617, X9725, XB-617, EU-36075, and X9730.

• UV617, UV647H, UV647, V1730 compatibility: These models share the same 8.4V Ni-MH battery platform, connector pin-out, and BMS handshake requirement. The UV light circuit and motor draw from the same cell, so voltage must stay within the pack's rated window for both functions to run together without a BMS trip.
• Bench tested on actual hardware: We ran this pack through the UV617's full charge cycle and confirmed the BMS accepted the cell without error flags. Motor start current and UV light load were applied simultaneously — the pack held voltage and the protection circuit did not trigger an overcurrent cutoff.
• Dock charging habit on this vacuum: Do not leave the UV617 on its charging dock continuously. Ni-MH cells in cordless vacuums degrade faster under trickle charge than under normal cycle use. Charge to full, then remove from the dock until the next use.

Suction dropping before the battery indicator reaches low on the UV617

Ni-MH cells under partial blockage or a clogged filter deliver the same indicated charge but sag in voltage under motor load. The UV617 motor draws more current when airflow is restricted, which pulls cell voltage below the BMS cutoff threshold early — before the indicator registers low. The result looks like a weak battery but is often a filter restriction problem. Clean the filter first, then retest; a healthy cell should sustain suction until the indicator actually drops.

Motor cuts out mid-clean then recovers after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the filter is partially blocked or the suction path is obstructed, sustained high-draw operation triggers the pack's overcurrent protection, which disconnects the motor briefly to prevent cell damage. The pack resets itself after a few seconds, which is why the vacuum recovers on its own. Clear the filter and suction path, then confirm resting pack voltage is above 7.5V before ruling out cell degradation.