LED indicator shows E8 or a specific red battery icon; runtime is extremely short even after full charge.

Safety first: Do not attempt to open the battery pack. Handle used batteries carefully and follow local recycling regulations.

• Step 1 – Confirm charging time: Fully charge the battery on the original Princess charger until the indicator shows 100% or solid green. This may take several hours.
• Step 2 – Measure runtime: Use the vacuum continuously on standard mode until it stops. If runtime is significantly below the specification in the manual (for example, less than 5–10 minutes when 20+ minutes is expected), the battery is worn.
• Step 3 – Try eco mode: Switch to the lowest power mode and repeat the test. If runtime is still very short, capacity loss is confirmed.
• Step 4 – Replace the battery pack: Purchase a genuine Princess replacement battery pack designed for your cordless model. Remove the old pack by pressing the release latch and sliding it out. Install the new pack until it clicks and charge fully before first use.
• Step 5 – Battery care tips: To extend the life of the new battery, avoid storing it fully discharged, keep it in a cool, dry place, and charge it at least every 3 months if not in regular use.