Unfortunately most phones are like that nowadays.
And a lot of laptops
Nearly all 5 of our laptop batteries are done … but we only really use them plugged in for work ..but still a pain …
I thought that would work but sometimes it doesn't. The power supplies don't have enough umph for the really peak but brief demands on the wiggle ampery which isn't a problem as long as the battery can be there to deliver peak current capability. But after a few years they can't.
I spent £££ on a Microsoft Surface which started to crap out after about 4 years, I changed the power supply for a more powerful one but that only worked for about a year. And can you change the battery? No (despite what the web says)