# hs.battery.watcher

Watch for battery/power state changes

This module is based primarily on code from the previous incarnation of Mjolnir by Steven Degutis.

# API Overview

Constructors - API calls which return an object, typically one that offers API methods

Methods - API calls which can only be made on an object returned by a constructor


Signature	`hs.battery.watcher.new(fn) -> watcher`
Type	Constructor
Description	Creates a battery watcher
Parameters	A function that will be called when the battery state changes. The function should accept no arguments.
Returns	An `hs.battery.watcher` object
Notes	Because the callback function accepts no arguments, tracking of state of changing battery attributes is the responsibility of the user (see https://github.com/Hammerspoon/hammerspoon/issues/166 for discussion)
Examples	None
Source	extensions/battery/libbattery_watcher.m line 44


Signature	`hs.battery.watcher:start() -> self`
Type	Method
Description	Starts the battery watcher
Parameters	None
Returns	The `hs.battery.watcher` object
Notes	None
Examples	None
Source	extensions/battery/libbattery_watcher.m line 75


Signature	`hs.battery.watcher:stop() -> self`
Type	Method
Description	Stops the battery watcher
Parameters	None
Returns	The `hs.battery.watcher` object
Notes	None
Examples	None
Source	extensions/battery/libbattery_watcher.m line 97