Vacuum’s battery drains while the tool is stored attached, even when not in use.

Safety first: Store batteries separately from tools when not in use.

• 1. Remove battery for storage: Detach the M18 pack from the vacuum when not in use, especially for long-term storage.
• 2. Check for LEDs: Ensure no LEDs remain faintly lit after release of the trigger. If they do, the PCB may be faulty.
• 3. Compare drain: Fully charge a battery, store it on the tool for a few days, and compare to a battery stored off the tool. If only the on-tool battery drains, the vacuum electronics are drawing current.
• 4. Replace control PCB: If parasitic drain is significant and inconvenient, replace the control PCB.