@@ -78,7 +78,7 @@ src/util/timer.c
              src/util/window.c )
 
 if( ENABLE_BATTERY )
-  set( SOURCES ${SOURCES} src/battery/battery.c )
+  set( SOURCES ${SOURCES} src/battery/battery.c  src/battery/linux.c)
   add_definitions( -DENABLE_BATTERY )
 endif( ENABLE_BATTERY )
 

@@ -2,7 +2,7 @@ /**************************************************************************
 *
 * Tint2 : battery
 *
-* Copyright (C) 2009 Sebastian Reichel <elektranox@gmail.com>
+* Copyright (C) 2009-2015 Sebastian Reichel <sre@ring0.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
@@ -47,6 +47,7 @@ PangoFontDescription *bat1_font_desc;
 PangoFontDescription *bat2_font_desc;
 struct batstate battery_state;
 int battery_enabled;
+int battery_tooltip_enabled;
 int percentage_hide;
 static timeout* battery_timeout;
 
@@ -61,10 +62,6 @@ char *battery_mclick_command;
 char *battery_rclick_command;
 char *battery_uwheel_command;
 char *battery_dwheel_command;
-gchar *path_energy_now;
-gchar *path_energy_full;
-gchar *path_current_now;
-gchar *path_status;
 int battery_found;
 
 #if defined(__OpenBSD__) || defined(__NetBSD__)
@@ -139,6 +136,7 @@ 
 void default_battery()
 {
 	battery_enabled = 0;
+	battery_tooltip_enabled = 1;
 	battery_found = 0;
 	percentage_hide = 101;
 	battery_low_cmd_sent = 0;
@@ -151,10 +149,6 @@ battery_mclick_command = NULL;
 	battery_rclick_command = NULL;
 	battery_uwheel_command = NULL;
 	battery_dwheel_command = NULL;
-	path_energy_now = NULL;
-	path_energy_full = NULL;
-	path_current_now = NULL;
-	path_status = NULL;
 	battery_state.percentage = 0;
 	battery_state.time.hours = 0;
 	battery_state.time.minutes = 0;
@@ -171,14 +165,6 @@ pango_font_description_free(bat1_font_desc);
 	bat1_font_desc = NULL;
 	pango_font_description_free(bat2_font_desc);
 	bat2_font_desc = NULL;
-	g_free(path_energy_now);
-	path_energy_now = NULL;
-	g_free(path_energy_full);
-	path_energy_full = NULL;
-	g_free(path_current_now);
-	path_current_now = NULL;
-	g_free(path_status);
-	path_status = NULL;
 	free(battery_low_cmd);
 	battery_low_cmd = NULL;
 	free(battery_lclick_command);
@@ -199,6 +185,8 @@ #if defined(__OpenBSD__) || defined(__NetBSD__)
 	if ((apm_fd != -1) && (close(apm_fd) == -1))
 		warn("cannot close /dev/apm");
 	apm_fd = -1;
+#elif defined(__linux)
+	free_linux_batteries();
 #endif
 }
 
@@ -224,95 +212,21 @@ size_t len = sizeof(sysctl_out);
 	battery_found = (sysctlbyname("hw.acpi.battery.state", &sysctl_out, &len, NULL, 0) == 0) ||
 					(sysctlbyname("hw.acpi.battery.time", &sysctl_out, &len, NULL, 0) == 0) ||
 					(sysctlbyname("hw.acpi.battery.life", &sysctl_out, &len, NULL, 0) == 0);
-#else // Linux
-	GDir *directory = 0;
-	GError *error = NULL;
-	const char *entryname;
-	gchar *battery_dir = 0;
-
-	directory = g_dir_open("/sys/class/power_supply", 0, &error);
-	if (error) {
-		g_error_free(error);
-	} else {
-		while ((entryname = g_dir_read_name(directory))) {
-			if (strncmp(entryname, "AC", 2) == 0)
-				continue;
-
-			gchar *path1 = g_build_filename("/sys/class/power_supply", entryname, "present", NULL);
-			if (g_file_test(path1, G_FILE_TEST_EXISTS)) {
-				g_free(path1);
-				battery_dir = g_build_filename("/sys/class/power_supply", entryname, NULL);
-				break;
-			}
-			g_free(path1);
-		}
-	}
-	if (directory)
-		g_dir_close(directory);
-	if (!battery_dir) {
-		fprintf(stderr, "ERROR: battery applet cannot find any battery\n");
-		battery_found = 0;
-	} else {
-		battery_found = 1;
-
-		g_free(path_energy_now);
-		path_energy_now = g_build_filename(battery_dir, "energy_now", NULL);
-		if (!g_file_test(path_energy_now, G_FILE_TEST_EXISTS)) {
-			g_free(path_energy_now);
-			path_energy_now = g_build_filename(battery_dir, "charge_now", NULL);
-		}
-		if (!g_file_test(path_energy_now, G_FILE_TEST_EXISTS)) {
-			fprintf(stderr, "ERROR: battery applet cannot find energy_now nor charge_now\n");
-			g_free(path_energy_now);
-			path_energy_now = NULL;
-		}
-
-		g_free(path_energy_full);
-		path_energy_full = g_build_filename(battery_dir, "energy_full", NULL);
-		if (!g_file_test(path_energy_full, G_FILE_TEST_EXISTS)) {
-			g_free(path_energy_full);
-			path_energy_full = g_build_filename(battery_dir, "charge_full", NULL);
-		}
-		if (!g_file_test(path_energy_full, G_FILE_TEST_EXISTS)) {
-			fprintf(stderr, "ERROR: battery applet cannot find energy_now nor charge_now\n");
-			g_free(path_energy_full);
-			path_energy_full = NULL;
-		}
-
-		g_free(path_current_now);
-		path_current_now = g_build_filename(battery_dir, "power_now", NULL);
-		if (!g_file_test(path_current_now, G_FILE_TEST_EXISTS)) {
-			g_free(path_current_now);
-			path_current_now = g_build_filename(battery_dir, "current_now", NULL);
-		}
-		if (!g_file_test(path_current_now, G_FILE_TEST_EXISTS)) {
-			fprintf(stderr, "ERROR: battery applet cannot find power_now nor current_now\n");
-			g_free(path_current_now);
-			path_current_now = NULL;
-		}
-
-		g_free(path_status);
-		path_status = g_build_filename(battery_dir, "status", NULL);
-		if (!g_file_test(path_status, G_FILE_TEST_EXISTS)) {
-			fprintf(stderr, "ERROR: battery applet cannot find battery status\n");
-			g_free(path_status);
-			path_status = NULL;
-		}
-
-		g_free(battery_dir);
-		battery_dir = NULL;
-	}
-
-	if (!path_status) {
-		battery_found = 0;
-		fprintf(stderr, "ERROR: battery applet cannot find any batteries\n");
-	}
+#elif defined(__linux)
+	battery_found = init_linux_batteries();
 #endif
 
 	if (!battery_timeout)
 		battery_timeout = add_timeout(10, 30000, update_battery_tick, 0, &battery_timeout);
 }
 
+const char* battery_get_tooltip(void* obj) {
+#if defined(__linux)
+	return linux_batteries_get_tooltip();
+#else
+	return g_strdup("No tooltip support for this OS!");
+#endif
+}
 
 void init_battery_panel(void *p)
 {
@@ -337,6 +251,9 @@ battery->area.size_mode = SIZE_BY_CONTENT;
 	battery->area._resize = resize_battery;
 	battery->area.on_screen = 1;
 	battery->area.resize = 1;
+
+	if (battery_tooltip_enabled)
+		battery->area._get_tooltip_text = battery_get_tooltip;
 }
 
 
@@ -420,82 +337,7 @@ new_percentage = -1;
 	else
 		new_percentage = sysctl_out;
 #else
-	FILE *fp = NULL;
-	char tmp[25] = "";
-	int64_t current_now = 0;
-	if (path_status) {
-		fp = fopen(path_status, "r");
-		if (fp != NULL) {
-			if (fgets(tmp, sizeof(tmp), fp)) {
-				if (strcasecmp(tmp, "Charging\n") == 0)
-					battery_state.state = BATTERY_CHARGING;
-				if (strcasecmp(tmp, "Discharging\n") == 0)
-					battery_state.state = BATTERY_DISCHARGING;
-				if (strcasecmp(tmp, "Full\n") == 0)
-					battery_state.state = BATTERY_FULL;
-			}
-			fclose(fp);
-		} else {
-			errors = 1;
-		}
-	} else {
-		errors = 1;
-	}
-
-	if (path_energy_now) {
-		fp = fopen(path_energy_now, "r");
-		if (fp != NULL) {
-			if (fgets(tmp, sizeof tmp, fp))
-				energy_now = atoi(tmp);
-			fclose(fp);
-		} else {
-			errors = 1;
-		}
-	} else {
-		errors = 1;
-	}
-
-	if (path_energy_full) {
-		fp = fopen(path_energy_full, "r");
-		if (fp != NULL) {
-			if (fgets(tmp, sizeof tmp, fp))
-				energy_full = atoi(tmp);
-			fclose(fp);
-		} else {
-			errors = 1;
-		}
-	} else {
-		errors = 1;
-	}
-
-	if (path_current_now) {
-		fp = fopen(path_current_now, "r");
-		if (fp != NULL) {
-			if (fgets(tmp, sizeof tmp, fp))
-				current_now = atoi(tmp);
-			fclose(fp);
-		} else {
-			errors = 1;
-		}
-	} else {
-		errors = 1;
-	}
-
-	if (current_now > 0) {
-		switch (battery_state.state) {
-		case BATTERY_CHARGING:
-			seconds = 3600 * (energy_full - energy_now) / current_now;
-			break;
-		case BATTERY_DISCHARGING:
-			seconds = 3600 * energy_now / current_now;
-			break;
-		default:
-			seconds = 0;
-			break;
-		}
-	} else {
-		seconds = 0;
-	}
+	update_linux_batteries(&battery_state.state, &energy_now, &energy_full, &seconds);
 #endif
 
 	battery_state.time.hours = seconds / 3600;
@@ -616,4 +458,4 @@ command = battery_dwheel_command;
 		break;
 	}
 	tint_exec(command);
-}+}

@@ -1,9 +1,8 @@ 
 /**************************************************************************
-* Copyright (C) 2009 Sebastian Reichel <elektranox@gmail.com>
+* Copyright (C) 2009-2015 Sebastian Reichel <sre@ring0.de>
 *
 * Battery with functional data (percentage, time to life) and drawing data
 * (area, font, ...). Each panel use his own drawing data.
-* Need kernel > 2.6.23.
 *
 **************************************************************************/
 
@@ -51,6 +50,7 @@ extern struct batstate battery_state;
 extern PangoFontDescription *bat1_font_desc;
 extern PangoFontDescription *bat2_font_desc;
 extern int battery_enabled;
+extern int battery_tooltip_enabled;
 extern int percentage_hide;
 
 extern int8_t battery_low_status;
@@ -62,6 +62,20 @@ extern char *battery_rclick_command;
 extern char *battery_uwheel_command;
 extern char *battery_dwheel_command;
 
+static inline gchar* chargestate2str(enum chargestate state) {
+	switch(state) {
+		case BATTERY_CHARGING:
+			return "Charging";
+		case BATTERY_DISCHARGING:
+			return "Discharging";
+		case BATTERY_FULL:
+			return "Full";
+		case BATTERY_UNKNOWN:
+		default:
+			return "Unknown";
+	};
+}
+
 // default global data
 void default_battery();
 
@@ -78,5 +92,12 @@ 
 int  resize_battery(void *obj);
 
 void battery_action(int button);
+
+#ifdef __linux
+gboolean init_linux_batteries();
+void free_linux_batteries();
+void update_linux_batteries(enum chargestate *state, gint64 *energy_now, gint64 *energy_full, int *seconds);
+const char* linux_batteries_get_tooltip();
+#endif
 
 #endif

@@ -0,0 +1,359 @@ 
+/**************************************************************************
+*
+* Tint2 : Linux battery
+*
+* Copyright (C) 2015 Sebastian Reichel <sre@ring0.de>
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License version 2
+* or any later version as published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+**************************************************************************/
+
+#ifdef __linux
+
+#include <stdlib.h>
+
+#include "common.h"
+#include "battery.h"
+
+struct psy_battery {
+	/* generic properties */
+	gchar*               name;
+	/* sysfs files */
+	gchar*               path_present;
+	gchar*               path_energy_now;
+	gchar*               path_energy_full;
+	gchar*               path_power_now;
+	gchar*               path_status;
+	/* sysfs hints */
+	gboolean             energy_in_uamp;
+	gboolean             power_in_uamp;
+	/* values */
+	gboolean             present;
+	gint                 energy_now;
+	gint                 energy_full;
+	gint                 power_now;
+	enum chargestate     status;
+};
+
+#define RETURN_ON_ERROR(err) if(error) { g_error_free(err); return FALSE; }
+
+static GList *batteries = NULL;
+
+static gboolean power_supply_is_battery(const gchar *entryname) {
+	gchar *path_type = g_build_filename("/sys/class/power_supply", entryname, "type", NULL);
+	GError *error = NULL;
+	gchar *type;
+	gsize typelen;
+
+	g_file_get_contents(path_type, &type, &typelen, &error);
+	g_free(path_type);
+	RETURN_ON_ERROR(error);
+
+	if(g_strcmp0(type, "Battery\n")) {
+		g_free(type);
+		return FALSE;
+	}
+
+	g_free(type);
+
+	return TRUE;
+}
+
+static gboolean init_linux_battery(struct psy_battery *bat) {
+	const gchar *entryname = bat->name;
+
+	bat->energy_in_uamp = FALSE;
+	bat->power_in_uamp = FALSE;
+
+	bat->path_present = g_build_filename("/sys/class/power_supply", entryname, "present", NULL);
+	if (!g_file_test(bat->path_present, G_FILE_TEST_EXISTS)) {
+		goto err0;
+	}
+
+	bat->path_energy_now = g_build_filename("/sys/class/power_supply", entryname, "energy_now", NULL);
+	if (!g_file_test(bat->path_energy_now, G_FILE_TEST_EXISTS)) {
+		g_free(bat->path_energy_now);
+		bat->path_energy_now = g_build_filename("/sys/class/power_supply", entryname, "charge_now", NULL);
+		bat->energy_in_uamp = TRUE;
+	}
+	if (!g_file_test(bat->path_energy_now, G_FILE_TEST_EXISTS)) {
+		goto err1;
+	}
+
+	if(!bat->energy_in_uamp) {
+		bat->path_energy_full = g_build_filename("/sys/class/power_supply", entryname, "energy_full", NULL);
+		if (!g_file_test(bat->path_energy_full, G_FILE_TEST_EXISTS))
+			goto err2;
+	} else {
+		bat->path_energy_full = g_build_filename("/sys/class/power_supply", entryname, "charge_full", NULL);
+		if (!g_file_test(bat->path_energy_full, G_FILE_TEST_EXISTS))
+			goto err2;
+	}
+
+	bat->path_power_now = g_build_filename("/sys/class/power_supply", entryname, "power_now", NULL);
+	if (!g_file_test(bat->path_power_now, G_FILE_TEST_EXISTS)) {
+		g_free(bat->path_power_now);
+		bat->path_power_now = g_build_filename("/sys/class/power_supply", entryname, "current_now", NULL);
+		bat->power_in_uamp = TRUE;
+	}
+	if (!g_file_test(bat->path_power_now, G_FILE_TEST_EXISTS)) {
+		goto err3;
+	}
+
+	bat->path_status = g_build_filename("/sys/class/power_supply", entryname, "status", NULL);
+	if (!g_file_test(bat->path_status, G_FILE_TEST_EXISTS)) {
+		goto err4;
+	}
+
+	return TRUE;
+
+err4:
+	g_free(bat->path_status);
+err3:
+	g_free(bat->path_power_now);
+err2:
+	g_free(bat->path_energy_full);
+err1:
+	g_free(bat->path_energy_now);
+err0:
+	g_free(bat->path_present);
+
+	return FALSE;
+}
+
+void free_linux_batteries() {
+	GList *l = batteries;
+
+	while (l != NULL) {
+		GList *next = l->next;
+		struct psy_battery *bat = l->data;
+
+		g_free(bat->name);
+		g_free(bat->path_status);
+		g_free(bat->path_power_now);
+		g_free(bat->path_energy_full);
+		g_free(bat->path_energy_now);
+		g_free(bat->path_present);
+
+		batteries = g_list_delete_link(batteries, l);
+		l = next;
+	}
+
+	batteries = NULL;
+}
+
+gboolean init_linux_batteries() {
+	GDir *directory = 0;
+	GError *error = NULL;
+	const char *entryname;
+
+	free_linux_batteries();
+
+	directory = g_dir_open("/sys/class/power_supply", 0, &error);
+	RETURN_ON_ERROR(error);
+
+	while ((entryname = g_dir_read_name(directory))) {
+		if(!power_supply_is_battery(entryname))
+			continue;
+
+		struct psy_battery *bat = g_malloc0(sizeof(*bat));
+		bat->name = g_strdup(entryname);
+		if(init_linux_battery(bat)) {
+			batteries = g_list_append(batteries, bat);
+			fprintf(stdout, "found battery \"%s\"\n", bat->name);
+		} else {
+			g_free(bat);
+			fprintf(stderr, RED "failed to initialize battery \"%s\"\n" RESET, entryname);
+		}
+	}
+
+	g_dir_close(directory);
+
+	return batteries != NULL;
+}
+
+static gboolean update_linux_battery(struct psy_battery *bat) {
+	GError *error = NULL;
+	gchar *data;
+	gsize datalen;
+
+	/* reset values */
+	bat->present = 0;
+	bat->status = BATTERY_UNKNOWN;
+	bat->energy_now = 0;
+	bat->energy_full = 0;
+	bat->power_now = 0;
+
+	/* present */
+	g_file_get_contents(bat->path_present, &data, &datalen, &error);
+	RETURN_ON_ERROR(error);
+	bat->present = (atoi(data) == 1);
+	g_free(data);
+
+	/* we are done, if battery is not present */
+	if(!bat->present)
+		return TRUE;
+
+	/* status */
+	bat->status = BATTERY_UNKNOWN;
+	g_file_get_contents(bat->path_status, &data, &datalen, &error);
+	RETURN_ON_ERROR(error);
+	if (!g_strcmp0(data, "Charging\n")) {
+		bat->status = BATTERY_CHARGING;
+	} else if (!g_strcmp0(data, "Discharging\n")) {
+		bat->status = BATTERY_DISCHARGING;
+	} else if (!g_strcmp0(data, "Full\n")) {
+		bat->status = BATTERY_FULL;
+	}
+	g_free(data);
+
+	/* energy now */
+	g_file_get_contents(bat->path_energy_now, &data, &datalen, &error);
+	RETURN_ON_ERROR(error);
+	bat->energy_now = atoi(data);
+	g_free(data);
+
+	/* energy full */
+	g_file_get_contents(bat->path_energy_full, &data, &datalen, &error);
+	RETURN_ON_ERROR(error);
+	bat->energy_full = atoi(data);
+	g_free(data);
+
+	/* power now */
+	g_file_get_contents(bat->path_power_now, &data, &datalen, &error);
+	RETURN_ON_ERROR(error);
+	bat->power_now = atoi(data);
+	g_free(data);
+
+	return TRUE;
+}
+
+void update_linux_batteries(enum chargestate *state, gint64 *energy_now, gint64 *energy_full, int *seconds) {
+	GList *l;
+
+	gint64 total_energy_now = 0;
+	gint64 total_energy_full = 0;
+	gint64 total_power_now = 0;
+
+	gboolean charging = FALSE;
+	gboolean discharging = FALSE;
+	gboolean full = FALSE;
+
+	for (l = batteries; l != NULL; l = l->next) {
+		struct psy_battery *bat = l->data;
+		update_linux_battery(bat);
+
+		total_energy_now += bat->energy_now;
+		total_energy_full += bat->energy_full;
+		total_power_now += bat->power_now;
+
+		charging |= (bat->status == BATTERY_CHARGING);
+		discharging |= (bat->status == BATTERY_DISCHARGING);
+		full |= (bat->status == BATTERY_FULL);
+	}
+
+	/* global energy stats */
+	*energy_now = total_energy_now;
+	*energy_full = total_energy_full;
+
+	/* build global state */
+	*state = BATTERY_UNKNOWN;
+	if (charging && !discharging)
+		*state = BATTERY_CHARGING;
+	else if (!charging && discharging)
+		*state = BATTERY_DISCHARGING;
+	else if (!charging && !discharging && full)
+		*state = BATTERY_FULL;
+
+	/* calculate seconds */
+	*seconds = 0;
+	if (total_power_now > 0) {
+		if(*state == BATTERY_CHARGING)
+			*seconds = 3600 * (total_energy_full - total_energy_now) / total_power_now;
+		else if(*state == BATTERY_DISCHARGING)
+			*seconds = 3600 * total_energy_now / total_power_now;
+	}
+}
+
+static gchar* energy_human_readable(struct psy_battery *bat) {
+	gint now = bat->energy_now;
+	gint full = bat->energy_full;
+	gchar unit = bat->energy_in_uamp ? 'A' : 'W';
+
+	if (full >= 1000000) {
+		return g_strdup_printf("%d.%d / %d.%d %ch",
+			now / 1000000, (now % 1000000) / 100000,
+			full / 1000000, (full % 1000000) / 100000,
+			unit);
+	} else if (full >= 1000) {
+		return g_strdup_printf("%d.%d / %d.%d m%ch",
+		now / 1000, (now % 1000) / 100,
+		full / 1000, (full % 1000) / 100,
+		unit);
+	} else {
+		return g_strdup_printf("%d / %d µ%ch", now, full, unit);
+	}
+}
+
+static gchar* power_human_readable(struct psy_battery *bat) {
+	gint power = bat->power_now;
+	gchar unit = bat->power_in_uamp ? 'A' : 'W';
+
+	if (power >= 1000000) {
+		return g_strdup_printf("%d.%d %c", power / 1000000, (power % 1000000) / 100000, unit);
+	} else if (power >= 1000) {
+		return g_strdup_printf("%d.%d m%c", power / 1000, (power % 1000) / 100, unit);
+	} else if (power > 0) {
+		return g_strdup_printf("%d µ%c", power, unit);
+	} else {
+		return g_strdup_printf("0 %c", unit);
+	}
+}
+
+const char* linux_batteries_get_tooltip() {
+	GList *l;
+	GString *tooltip = g_string_new("");
+	gchar *result;
+
+	for (l = batteries; l != NULL; l = l->next) {
+		struct psy_battery *bat = l->data;
+
+		if (tooltip->len)
+			g_string_append_c(tooltip, '\n');
+
+		g_string_append_printf(tooltip, "%s\n", bat->name);
+
+		if (!bat->present) {
+			g_string_append_printf(tooltip, "\tnot connected");
+			continue;
+		}
+
+		gchar *power = power_human_readable(bat);
+		gchar *energy = energy_human_readable(bat);
+		gchar *state = (bat->status == BATTERY_UNKNOWN) ? "Level" : chargestate2str(bat->status);
+
+		guint percentage = 0.5 + ((bat->energy_now <= bat->energy_full ? bat->energy_now : bat->energy_full) * 100.0) / bat->energy_full;
+
+		g_string_append_printf(tooltip, "\t%s: %s (%u %%)\n\tPower: %s",
+			state, energy, percentage, power);
+
+		g_free(power);
+		g_free(energy);
+	}
+
+	result = tooltip->str;
+	g_string_free(tooltip, FALSE);
+
+	return result;
+}
+
+#endif

@@ -434,6 +434,11 @@ if (percentage_hide == 0)
 			percentage_hide = 101;
 #endif
 	}
+	else if (strcmp (key, "battery_tooltip") == 0) {
+#ifdef ENABLE_BATTERY
+		battery_tooltip_enabled = atoi(value);
+#endif
+	}
 
 	/* Clock */
 	else if (strcmp (key, "time1_format") == 0) {

@@ -92,6 +92,7 @@ // battery
 GtkWidget *battery_hide_if_higher, *battery_alert_if_lower, *battery_alert_cmd;
 GtkWidget *battery_padding_x, *battery_padding_y, *battery_font_line1, *battery_font_line2, *battery_font_color;
 GtkWidget *battery_background;
+GtkWidget *battery_tooltip;
 GtkWidget *battery_left_command, *battery_mclick_command, *battery_right_command, *battery_uwheel_command, *battery_dwheel_command;
 
 // systray
@@ -3829,6 +3830,20 @@ gtk_table_set_row_spacings(GTK_TABLE(table), ROW_SPACING);
 	gtk_table_set_col_spacings(GTK_TABLE(table), COL_SPACING);
 	row = 0, col = 2;
 
+	label = gtk_label_new(_("Tooltips"));
+	gtk_misc_set_alignment(GTK_MISC(label), 0, 0);
+	gtk_widget_show(label);
+	gtk_table_attach(GTK_TABLE(table), label, col, col+1, row, row+1, GTK_FILL, 0, 0, 0);
+	col++;
+
+	battery_tooltip = gtk_check_button_new();
+	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(battery_tooltip), 1);
+	gtk_widget_show(battery_tooltip);
+	gtk_table_attach(GTK_TABLE(table), battery_tooltip, col, col+1, row, row+1, GTK_FILL, 0, 0, 0);
+	col++;
+	gtk_tooltips_set_tip(tooltips, battery_tooltip, _("If enabled, shows a tooltip with detailed battery information when the mouse is moved over the battery widget."), NULL);
+
+	row++, col = 2;
 	label = gtk_label_new(_("Left click command"));
 	gtk_misc_set_alignment(GTK_MISC(label), 0, 0);
 	gtk_widget_show(label);

@@ -95,6 +95,7 @@ // battery
 extern GtkWidget *battery_hide_if_higher, *battery_alert_if_lower, *battery_alert_cmd;
 extern GtkWidget *battery_padding_x, *battery_padding_y, *battery_font_line1, *battery_font_line2, *battery_font_color;
 extern GtkWidget *battery_background;
+extern GtkWidget *battery_tooltip;
 extern GtkWidget *battery_left_command, *battery_mclick_command, *battery_right_command, *battery_uwheel_command, *battery_dwheel_command;
 
 // systray

@@ -560,6 +560,7 @@ {
 	fprintf(fp, "#-------------------------------------\n");
 	fprintf(fp, "# Battery\n");
 
+	fprintf(fp, "battery_tooltip = %d\n", gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(battery_tooltip)) ? 1 : 0);
 	fprintf(fp, "battery_low_status = %g\n", gtk_spin_button_get_value(GTK_SPIN_BUTTON(battery_alert_if_lower)));
 	fprintf(fp, "battery_low_cmd = %s\n", gtk_entry_get_text(GTK_ENTRY(battery_alert_cmd)));
 	fprintf(fp, "bat1_font = %s\n", gtk_font_button_get_font_name(GTK_FONT_BUTTON(battery_font_line1)));
@@ -898,12 +899,13 @@ }
 	}
 
 	/* Battery */
-	else if (strcmp(key, "systray") == 0) {
+	else if (strcmp(key, "battery") == 0) {
 		// Obsolete option
 		config_has_battery = 1;
 		config_battery_enabled = atoi(value);
-	}
-	else if (strcmp(key, "battery_low_status") == 0) {
+	} else if (strcmp(key, "battery_tooltip") == 0) {
+		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(battery_tooltip), atoi(value));
+	} else if (strcmp(key, "battery_low_status") == 0) {
 		gtk_spin_button_set_value(GTK_SPIN_BUTTON(battery_alert_if_lower), atof(value));
 	}
 	else if (strcmp(key, "battery_low_cmd") == 0) {
@@ -1464,4 +1466,4 @@ return "next_task";
 	if (gtk_combo_box_get_active(GTK_COMBO_BOX(combo)) == 10)
 		return "prev_task";
 	return "none";
-}+}