We can use the charger even when the room temperature exceeds 77°F (25°C). However, it is important to note that the operating temperature of our wall chargers is specified as 32 to 104°F (0 to 40°C).

Please be aware that due to certification requirements, the user manual states that "The maximum ambient temperature during use of the appliance must not exceed 77°F (25°C)." This temperature is used for testing and certification purposes, and as a result, we are only permitted to print 77°F (25°C) on the product. 

Nevertheless, rest assured that the charger is safe to use within the range of 32 to 104°F (0 to 40°C). Additionally, the storage temperature range for the charger is -4 to 158°F (-20 to 70°C).

If you have any questions, please contact us for further assistance.