Cordless Shark vacuum runs for only a few minutes on a full charge, then shuts off without any error lights.

Safety first: Always remove the battery before storage and avoid exposing it to extreme temperatures.

• 1. Confirm full charge: Place the battery on the charger until it indicates full. Then immediately test run time on a low power setting.
• 2. Compare modes: Run the vacuum in normal mode and then in MAX/Boost. If run time is extremely short in all modes (e.g., under 5 minutes), the battery capacity is likely degraded.
• 3. Test with another battery: If you have a second Shark battery, compare run times. A large difference confirms the original battery is worn out.
• 4. Replace the battery pack: Install a new genuine Shark battery rated for your model. Avoid deep discharging the new battery; recharge when performance drops noticeably rather than running until it stops.