The things that kill smartphone batteries today are age and power cycles. It doesn’t matter if you charge from 0% to 100% in one go or from 90% to 100% ten times. Both add up to one power cycle.
To keep your battery fresh for as long as possible, always keep the phone connected to a charger. No battery cycles. It will get worse after a few years anyway.
To keep your battery fresh for as long as possible, always keep the phone connected to a charger. No battery cycles. It will get worse after a few years anyway.