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Introducing the perfect solution for all your lighting needs during power cuts – OCTNL 1 WATT Emergency Rechargeable Inverter BulbBuilt-in rechargeable lithium battery with automatic charging feature: The bulb is equipped with a built-in rechargeable lithium battery, eliminating the need for external batteries. It features an automatic charging feature that charges the battery whenever the bulb is connected to a power source.8-10 hours for a full battery charge: It takes approximately 8-10 hours for the bulb's built-in rechargeable lithium battery to fully charge. This allows you to quickly replenish the battery for the next use.Backup of up to 4 hours: The bulb offers a reliable backup of up to 4 hours, ensuring continuous illumination during power outages or emergency situations.