Vacuum stops abruptly under light load; E5 indicator or beeping pattern; restarts after battery removal

Safety: Do not attempt to open the battery pack; this is not user-serviceable.

• Charge battery fully: Place the battery on a DeWalt charger until it reaches full charge. Reinstall and test.
• Test with another battery: If the vacuum runs normally with a different pack, the original battery is weak or failing and should be replaced.
• Inspect contacts: Clean the battery and tool contacts with a dry cloth. Ensure the battery latches firmly with no wobble.
• Usage pattern: Avoid running the battery to complete shutdown repeatedly; recharge when performance drops to extend battery life.
• If multiple batteries show E5 quickly: The tool's undervoltage detection circuit on the control PCB may be faulty and require replacement.