I'm pretty sure there's a typo on the ibook users manual otherwise I'm replacing the battery wrong. The book shows and says you should put the battery on it's left side then gently push it down on the right side until clicks into place. The picture ends up showing the battery lock in locked position as well. This doesn't seem like the way to put the battery in place. The only way to put the battery in place is to put the ibook in unlock position then push the batterty into the ibook and holding it down while changing the lock into lock position. You can not put the battery on it's left side and have it click into place while the ibook is still in "locked" position for the battery 