The p20 pro is a great phone. Its pictures can be amazing. I find the camera to be very inconsistent. I would probably trade my p20 in for a note, not the other way around.
How long would it take for you to lose 60% of the battery capacity? If we are limiting our giant battery to 40%, seems like it would be better to just let it ride unless you kept your phone for years.
TITACUTE Huawei Mate 9 Super Charger Cable, 6.6FT Quick Charging Cable 5A USB C Cable Durable Nylon Braided Cords Data Cable Type A to Type C Cable for Huawei Mate 9 Pro P10 Plus Mate 10 Pro Red
This worked well for me.