Runtime is much shorter than specified, but no battery error code is shown.

Safety first: Handle the battery carefully and avoid shorting contacts.

• Step 1 – Clean filters and airflow path: Reduce load by ensuring all filters and airways are clean.
• Step 2 – Compare modes: Measure runtime on eco/low mode versus turbo. If both are significantly reduced, the battery is likely worn.
• Step 3 – Warm up battery: If used in a cold room, allow the battery to warm to room temperature before use.
• Step 4 – Replace battery: Install a new genuine Princess battery pack if runtime remains poor.