回答“How's your battery doing after roughly two years?”When it was new, its maximum capacity was probably higher than its advertised capacity, it was probably around 105% or so (which would have been reported as 100%). Now you're at 93% so you've lost about 12% which is not bad; it means that the battery is of good quality and is holding up well. Chrome uses a lot more battery than Safari. Tabs that aren't doing much can still take a lot of battery. If you're not using Chrome for a little while, close it down by typing COMMAND-Q. You don't have to close down other apps like Preview, Microsoft Word, etc, you can just leave them open, they don't eat your battery if they're just sitting there. But you do want to close down Chrome when you're not using it. If you click on Activity Monitor, click on CPU, and you're just looking at that window, you want to see that the CPU is about 98% idle. To get the advertised battery life I have to (a) use Safari, and (b) turn off flash for almost all websites.