bat

Shows in a textbox the remaining time and percentage capacity of your laptop battery, as well as the current wattage. Multiple batteries are supported.

Displays a notification when battery is low or critical.

mybattery = lain.widgets.bat()

Input table

Variable	Meaning	Type	Default
timeout	Refresh timeout seconds	int	30
battery	Single battery id	string	"BAT0"
batteries	Multiple batteries id table	table of strings	{"BAT0"}
ac	AC	string	"AC0"
notify	Show notification popups	string	"on"
settings	User settings	function	empty function

You only have to define one between battery and batteries.

If you have one battery, you can either use args.battery = "BAT*" or args.batteries = {"BAT*"}. Of course, if you have multiple batteries, you need to use the latter option.

To disable warning notifications, set notify to "off".

settings can use the bat_now table, which contains the following strings:

• status, battery status ("N/A", "Discharging", "Charging", "Full");
• n_status[i], i-th battery status (like above);
• ac_status, AC-plug flag (0 if cable is unplugged, 1 if plugged, "N/A" otherwise);
• perc, total charge percentage (integer between 0 and 100 or "N/A");
• n_perc, i-th battery charge percentage (like above);
• time, time remaining until charge if charging, until discharge if discharging (HH:SS string or "N/A");
• watt, battery watts (float with 2 decimals).

and can modify the following two tables, which will be the preset for the naughty notifications:

• bat_notification_low_preset(used if battery charge level <= 15)
• bat_notification_critical_preset (used if battery charge level <= 5)

Check here for the list of variables they can contain.

Default definition:

bat_notification_low_preset = {
        title = "Battery low",
        text = "Plug the cable!",
        timeout = 15,
        fg = "#202020",
        bg = "#CDCDCD"
}

bat_notification_critical_preset = {
        title = "Battery exhausted",
        text = "Shutdown imminent",
        timeout = 15,
        fg = "#000000",
        bg = "#FFFFFF"
}

Output table

Variable	Meaning	Type
widget	The widget	wibox.widget.textbox
update	Update widget	function

The update function can be used to refresh the widget before timeout expires.

Notes

• Another common identifier for ac is ACAD.
• If your widget is always on "N/A" with default settings, and you have a single battery, then BAT0 is not your battery file. Locate the right one in /sys/class/power_supply/ and set battery properly. For instance, with BAT1:

batwidget = lain.widgets.bat({
    battery = "BAT1",
    -- [...]
})

Known issues

The N/A battery percentage when discharging

It has been reported (#250) that, in some configurations, the file /sys/class/power_supply/BAT*/current_now could be missing. When this is the case, the widget can't calculate the battery percentage when discharging (other tools like acpi can't work properly too).

If you're missing current_now, you can use this widget instead.