Somehow, my laptop went from 92% power to fully drained (as in, it shut off on its own) in just 52 minutes. Despite the fact that all I had open were Notepad, Chrome (admittedly with around nine or ten tabs open, but I don't know if those would account for the rapid drain), and Acrobat Reader (two very long documents; again, could that cause drain, even when minimized?). The battery is, admittedly, five years old (system: Toshiba Satellite C855-S5350), and when I set up a battery report, it turns out that its full charge capacity has declined from 47,520 mWh to 38,383 mWh. Which should still manage two hours (I think the original capacity was earmarked for three hours, at least). I had the machine cleansed of malware back in November.