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p40pro with 66w fast charge will not harm the battery, when using 66w fast charge to charge the mobile phone, the mobile phone will not support the corresponding fast charge protocol, and then switch to standard current charging.
Huawei P40Pro is equipped with 4200mAh high-density large-capacity battery, with AI power management, so that every bit of power of the phone is used just right. Theoretical standby time up to 15.8 days, strong endurance; 40W wired super fast charge, theoretical full only takes about 1.36 hours, Huawei P40 Pro phone supports a maximum 10V\/4A super fast charge, compatible with 10V\/2.25A or 5V\/4.5A or 4.5V\/5A, compatible with 9V\/2A fast charge. The phone also supports 27W Huawei Wireless Super Fast Charge.