display-battery-mode is an interactive autoloaded compiled Lisp function in `battery.el'.

It is bound to <menu-bar> <options> <showhide> <showhide-battery>.

(display-battery-mode &optional ARG)

Toggle battery status display in mode line (Display Battery mode).
With a prefix argument ARG, enable Display Battery mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.

The text displayed in the mode line is controlled by
`battery-mode-line-format' and `battery-status-function'.
The mode line is be updated every `battery-update-interval'