Xbattbar shows the current (laptop) battery status in the X window
environment. The battery indicator of this program is very simple: a simple
bar in the bottom of your display. With its color, it indicates the
AC-line status (plugged in or off-line), and battery
charging/remaining level.

WWW: http://iplab.aist-nara.ac.jp/member/suguru/xbattbar.html

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sumikawa@FreeBSD.org