I think in general a lot of batteries in mobile devices for a couple years dropped off dramatically if charging to full regularly (ex: on the charger all night every night). My Nexus 4 and Nexus 6P were really bad here... my Pixel 2XL has been pretty good on battery life still after about a year now.
I think it was mostly immature technology adopted relatively early. There have been advances in battery tech, and it takes time to work kinks out.
I think it was mostly immature technology adopted relatively early. There have been advances in battery tech, and it takes time to work kinks out.