Vacuum runs only intermittently; it starts and stops when the handle is moved or shaken.

Safety first: Remove the battery before inspection.

• Check battery fit: Insert the battery and ensure it clicks firmly into place. If it feels loose or can be wiggled easily, the battery rails or locking tab may be worn.
• Inspect terminals: Look for discoloration or pitting on the battery and tool contacts. Clean with a dry cloth.
• Test while stationary: With the battery installed, hold the vacuum still and run it. If it runs steadily until you move the handle, a loose internal connection is likely.
• Avoid flexing the handle: Until repaired, avoid twisting or bending the handle area, as this can worsen wiring damage.
• Service required: Internal inspection is needed to locate and repair loose connectors or cracked solder joints on the PCB. This should be done by a qualified technician.