OK so Windows used to warn me my battery is low when it is at 10%. However, it no longer does, so it will now shut down without warning me to plug in my charger. Why is it doing this, and what can I do to make it warn me again? It is so ridiculous that I have to restart the computer just because the battery died and I wasn't warned by the system.
Double check to see what you have set under Battery in your Power Options settings like below. Make sure that you have the "Low" and "Critical" percentage and action set for the level and action you want.
Low needs to be a higher percentage than Critical for Low's action to be performed first.