Add battery information.

.config/i3status/config

@@ -21,6 +21,7 @@ order += "disk /mnt/das/hdd2tb-1-main"
 order += "disk /mnt/das/hdd4tb-1-main"
 order += "read_file borg_backup"
 order += "volume master"
+order += "battery 0"
 order += "tztime local"
 
 read_file cmusctl.status {
@@ -84,13 +85,26 @@ read_file borg_backup {
 }
 
 volume master {
-	format = "🎵: %volume"
-	format_muted = "🔇: %volume"
+	format = "🔊 %volume"
+	format_muted = "🔇 %volume"
 	device = "default"
 	mixer = "Master"
 	mixer_idx = 0
 }
 
+battery 0 {
+	format = "%status %percentage"
+	format_down = "No battery"
+	status_chr = "⚡"
+	status_bat = "🪫"
+	status_full = "🔋"
+	status_unk = "?"
+	low_threshold = 20
+	last_full_capacity = true
+	integer_battery_capacity = true
+	path = "/sys/class/power_supply/BAT%d/uevent"
+}
+
 tztime local {
 	format = "%Y-%m-%d %H:%M:%S"
 }