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BatteryBot Battery Indicator is the original battery indicator app for Android™, released in 2009 as simply "Battery Indicator." Both the free and the Pro versions have maintained a 4.5+ star rating in Google Play from the beginning. It offers two modes: the original status bar indicator and now also a desktop widget. You can use either or both, as you please.
BatteryBot monitors and shows your battery charge level (percent) as an icon in your status bar, with how much time you have left, temperature, health, voltage, and time since plugged / unplugged in the notification area. It now also has a 1x1 app widget. The Pro version also has user-configurable alarms, logs, mA current information, and a large (4x1) widget.
Give it a try -- it's free and open source! BatteryBot Battery Indic