Vacuum shows “Err 11”; runtime is extremely short even after a full charge.

Safety first: Turn OFF the vacuum and remove it from the charger before handling the battery.

• Check charge indicator: Fully charge the vacuum until the battery indicator shows 100% or solid green.
• Measure runtime: Run the vacuum continuously on standard mode until it stops. If runtime is far below the specification (e.g., less than 25–30% of normal), the battery is likely worn out.
• Inspect battery: Remove the battery and check for swelling, cracks, or leakage. Do not use a damaged battery.
• Replace battery: Install a new genuine iRobot lithium‑ion battery pack designed for your cordless model. Avoid third‑party packs that may not communicate correctly with the vacuum.
• Optimize usage: Avoid storing the vacuum fully discharged and keep it on the dock or charger when not in use to maintain battery health.