(1) To ensure that your batteries charge properly, please be sure to use a charging adapter with an output voltage of at least 12V. Failure to do so may result in the batteries not charging at all, significantly prolonged charging times, or the battery level indicator lights failing to illuminate; in such cases, the input indicator light will flash green. When charging four batteries simultaneously, please use a charging adapter with a power output of 40W or higher. The specific requirements are as follows: <19W: 1 charging channel enabled. <28W: 2 charging channels enabled. <40W: 3 charging channels enabled. ≥40W: 4 charging channels enabled. Example: If your charging adapter has a power output of less than 40W but you need to charge four batteries, the charging hub will automatically identify the battery with the highest remaining charge level and prioritize charging it first, thereby ensuring that at least one battery becomes available for use as soon as possible. For instance, if you use an 18W adapter (12V/1.5A) to charge four batteries—with charge levels of 1%, 10%, 30%, and 60%, respectively—the charging hub will charge only one battery at a time. It will prioritize charging the 60% battery first; once that battery is fully charged, it will proceed to charge the remaining batteries in descending order of charge level (30%, 10%, and 1%), ensuring that the charging time for each individual battery remains within 2.5 hours.