Lenovo Ideapad S145 15″ has a very wide target, given the fact that it can be bought with either a Pentium or a Core i7 processor.
1. Remove the bottom plate
There are 10 Phillips-head screws that you have to take out of your way to remove the bottom plate. Then, as traditionally, pry the plastic panel up by preferably using a plastic tool. Be really careful, though, because, in order to keep the price down, Lenovo has given up on build quality.
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https://laptopmedia.com/highlights/inside-lenovo-ideapad-s145-15-disassembly-and-upgrade-options/
