Cell phones, tablets and notebook PCs all used to have replaceable batter. Now the batteries are soldered into the motherboards. Battery won’t hold a charge after 3 to 5 years? No problem. Throw away your now useless device and buy a new one. Same principle but on a larger scale.
I know that is true with Apple devices, but all of our family's current laptops have batteries that can be replaced. But you do have to take the back cover off which involves removing about 10 screws and then using a guitar pick to pry it off..
#33 Try https://www.ifixit.com/
The manufacturers do make it difficult by gluing and or soldering the battery in the cell or laptop.
I think the gov’t wanted this as you cannot remove the battery and can be tracked.