There are surprisingly few options out there for tracking details about your battery via live wallpaper (and those that are out there are quite ugly), but Battery Core seems to fill the niche quite nicely. The live wallpaper consists of a large, Tron-ish rotating disc, the speed of which varies by your remaining charge. Slow rotation means a low battery, whereas higher velocity means higher capacity. You also get text readouts of the level, charging / not charging status, voltage, and battery temperature.

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