If necessary, the 55W charging head refers to the maximum output capacity of the charging head, just like a person can move a bag of 100 pounds, and the 100 pounds of it can certainly be moved.
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50W wireless charger refers to the maximum charging capacity of the charger to charge the mobile phone, if the maximum power of the charging head is less than 50W, the maximum output power is the same as the charging head, if the power of the charging head is greater than 50W, the maximum power of the charger is 50W.
The 55w charger can be used without problem