Yeah the battery is buggered.
The cookies are finished, and they were pretty good. Every cookie I've ever baked has burned on the bottom though - they'll be just right or slightly underdone on top, but the bottom is already dark and crispy. IDK how to solve this.
What type of cookie sheet are you using?
Your cookie sheet ideally needs to be lighter in color. I had a darker baking sheet once and it killed the bottoms of my cookies, because it absorbed more heat and overcooked the bottoms.
Next, check the temp of your oven. Get an oven thermometer. Your oven might be hotter in some regions, although if all your cookies are dark on the bottom this might be it. If you discover your oven has hot spots, just rotate your cookies halfway during baking. If you bake two sheets at a time, turn the sheets around halfway through, AND rotate the sheets from rack to rack.
Is your oven electric or gas? Make sure the cookie sheet is on the middle rack.
Another trick: When you remove the cookies from the oven, let it sit on the cookie sheet for 2-3 mins, and then remove the cookies to a rack to cool. Let the cookie sheet cool down before you put more batter on it. This way you can remove it before it gets too done, as it still bakes a bit as it sits on the sheet. Cookies are done when they brown around the edges.
I only bake (now) using parchment paper. Before, I used non stick aluminum foil. I have completely stopped dropping the dough directly onto the cookie sheet. Both ways, I don't have dark cookies and they don't stick to the cookie sheet. Plus it's so much easier to keep everything clean.
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