Huawei nova7 mobile phone with 66 watts of fast charging source adapter will not hurt the battery. Because this phone theoretically supports 40 watts of fast charge. However, if you use a 66-watt fast charge source adapter to charge, its power will only be reduced to 10 watts. Because the general 66 watt fast charging source adapter does not support 40 watts of power output. So it's compatible down to 10 watts.
It's bad for cell phone batteries. nova7 its calibration charging power is 40w, with 66w fast charge, obviously the input current power, has exceeded his allowable maximum power, this charging method will harm the battery.
Huawei nova7 with 66w fast charge generally does not damage the battery, this mobile phone in the process of normal fast charge can generally ensure the use of the charging speed and the normal use of the battery usually does not cause damage