I don't know if it's unique to them, but Sony slow-charges up to 80-90% until about an hour before you set your alarm, then brings you up to 100% before you wak

I don't know if it's unique to them, but Sony slow-charges up to 80-90% until about an hour before you set your alarm, then brings you up to 100% before you wake up. Seems to work well and the battery degradation I've seen, after 4 years, has been very minimal.