Fast charging
When I charge my iPhone SE (2020) variant with 2 amp charger
slight warmness I feel at back of phone
not much of heat thou..,
is it safe to use 5V =2A
charger .
as box product supplies 1A
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The "charger" is in the phone, you are only providing a power source, so provided it is a certified USB source and is 1 amp (5 watts) or more you can do no damage.