Samsung phones have the capability to do this. There's a setting you can set to only charge to 80%. It looks like they mention that in the article.
Android phones in general have something called Adaptive Charging that attunes to when you normally need a full charge. For instance if you are charging at night while you're sleeping it will charge slower than it would during the day to improve battery health.
I've had a LR3 for about 8 years. It was $500 back then too. Still works really well. Sometimes I have to replace parts, but the maintenance is fairly simple and Whisker has YouTube videos for how to do everything. Still highly recommended. Worth every penny.
The only reason I visit Reddit anymore is because it's a vast sea of human experience and knowledge. Usually I just search Google with "[topic I'm interested in learning about] site:reddit.com".
@seanziepples
@lemmy.world