Index: rockbox_svn/apps/gui/gwps-common.c
===================================================================
--- rockbox_svn.orig/apps/gui/gwps-common.c
+++ rockbox_svn/apps/gui/gwps-common.c
@@ -1328,6 +1328,16 @@ static char* get_tag(struct wps_data* wp
                     return buf;
                 }
 
+                case 'm': /* estimated battery time in minutes */
+                {
+                    int t = battery_time();
+                    if (t >= 0)
+                        snprintf(buf, buf_size, "%dm", t);
+                    else
+                        strncpy(buf, "?m", buf_size);
+                    return buf;
+                }
+
                 case 's': /* sleep timer */
                 {
                     if (get_sleep_timer() == 0)