Vacuum shows E13 and will not start; often after long storage without use.

Safety first: Do not attempt to jump-start or bypass the battery protection.

• Connect the vacuum or battery pack to the original Roidmi charger and leave it connected for at least 4–6 hours, even if no LEDs light initially.
• If the battery LEDs or display do not respond after several hours, disconnect the charger.
• Try a different wall outlet to rule out power issues.
• If E13 remains and the battery will not accept charge, the pack is likely permanently damaged. Replace the complete battery pack.