Add some battery related stuff to the nodes table.

	battery_voltage float default NULL,
	battery_percentage float default NULL,
	battery_timestamp int(10) unsigned default NULL,

sql/database-create.sql

@@ -1075,6 +1075,9 @@ CREATE TABLE nodes (
   stated_tag varchar(32) default NULL,
   rtabid smallint(5) unsigned NOT NULL default '0',
   cd_version varchar(32) default NULL,
+  battery_voltage float default NULL,
+  battery_percentage float default NULL,
+  battery_timestamp int(10) unsigned default NULL,
   PRIMARY KEY  (node_id),
   KEY phys_nodeid (phys_nodeid),
   KEY node_id (node_id,phys_nodeid),

sql/database-migrate.txt

@@ -2242,3 +2242,10 @@ last_net_act,last_cpu_act,last_ext_act);
          stack_id='<stackid>';
        update switch_stack_types set stack_id='Control' where \
          stack_id='<stackid>';
+
+1.294: Add some battery stuff for robots to the nodes table.
+
+        alter table nodes add battery_voltage float default NULL;
+        alter table nodes add battery_percentage float default NULL;
+        alter table nodes add battery_timestamp int(10) unsigned default NULL;
+