It should be fully charged in over an hour.
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The Samsung Fold3 is equipped with two batteries, and the two batteries are balanced in power consumption and charging management. Although it is very thin and flat, the thickness is only 6.9mm, but its power is not small, a full 4380mAh.
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It takes about 1 hour and 40 minutes to fully charge the battery with 15W power, which is still relatively long
About 40 minutes. That's pretty fast. Just about 40 minutes