66 W is the maximum charging power, and can only be reached when the dedicated 66 W HUAWEI SuperCharge charger and cable are used.
Actual battery life depends on actual usage conditions. IP68 rating means that based on certain defined test conditions, the device is protected against harmful ingress of static water at up to 1.5 meters, for up to 30 minutes, meanwhile the temperature difference between water and device is not more than 5☌. Submersion in liquid and the resulting damage is not covered by the warranty. Refer to the manual for cleaning and drying instructions. Do not charge the phone when it is wet or in moist environments. Splash, water, and dust resistance are not permanent conditions and resistance may decrease over time with normal use.