Nilfisk High-Load Battery or Motor Inefficiency

Runtime is normal on low power but drops sharply on MAX mode

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Possible Causes

Aging battery with high internal resistance, Motor drawing excessive current on MAX, Clogged filters increasing load, Poor electrical connections causing voltage drop

How to Fix / Troubleshooting

Safety: Remove the battery before maintenance.

  • Clean filters and air path: Reduce load by ensuring all filters and passages are clear.
  • Compare runtimes: Time the vacuum on low and MAX modes. Some reduction is normal, but extremely short MAX runtime indicates battery or motor issues.
  • Test with another battery: If available, compare performance. If a new battery improves MAX runtime, replace the old pack.
  • If issue persists with new battery: The motor may be inefficient or partially failing and should be inspected by a technician.
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Repair Difficulty

Easy 2/5

Required Part

Nilfisk Lithium-Ion Battery Pack
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