Does charging overnight impact battery life? Something I thought I heard recently, so I have been avoiding my normal nightly charge and doing at desk next day instead.
I think batteries degrade with each charge cycle, and the deeper the charge cycle, eg. from 10% to 100%, the more damaging. If you charge every single night you are wearing out your battery faster than if you keep your battery between, say 40% and 90%.
I guess the bottom line is if you replace your phone every two years or sooner go ahead and charge every night, the battery will degrade but should get you to the two year mark.
If you plan on keeping the phone longer than two years I wouldn't charge every night. I'm in the "keeping more than two year" category. With the strong battery life in my 2 XL I typically go to bed with it at 60% or so. When I wake up I plug it in, do my morning routine and when I go to work 45 minutes later I typically have 90% charge or so. Sometimes I don't charge in the morning, I can make it until work is over, then plug it in.
The idea is to reduce the number of charge cycles and avoid deep charging cycles.