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To determine when the Best Buy essentials™ 20W 10,000mAh Portable Charger is fully charged, observe the LED indicator lights located on the side of the device. During the charging process, these lights will blink to indicate the current charge level. Once the device is fully charged, all the LED lights will remain solid and stop blinking. Typically, the charger features four LED lights, each representing approximately 25% of the total battery capacity. Therefore, when all four lights are illuminated and no longer blinking, the power bank has reached a full charge. If you have any other questions or need further assistance, feel free to ask! Ivy | Best Buy essentials Support
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