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When the power pack cannot be charged, using TYPEC to charge the main unit is not possible, so it never reaches full charge. We recommend using AC to charge the main unit. We apologize for the inconvenience.
Yes
Yes, you can. However, be aware that if either the Extra Battery or the RIVER 3 Plus is completely drained, you might not be able to charge the RIVER 3 Plus using the USB-C port on the Extra Battery. In such a case, you need to first charge either the Extra Battery or the RIVER 3 Plus to above 5% before you can continue charging the RIVER 3 Plus.
Yes, it can charge simultaneously.
Yes, it will. The power is displayed as follows: 1W for normal brightness, 3W for increased brightness, and 2W for flashing.