That's very unusual. What it means is that your MySQL user does not have permission to run SQL queries to alter tables. However, I think it may not be this.
There is no postbit table in vB3 (assuming you are running this query on a vB3 board). Also I've never seen that format of query you are trying to run. So run this query:
[sql]
ALTER TABLE `user` ADD `battle` INT( 6 ) DEFAULT '0' NOT NULL
[/sql]
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