How to add an admin function only to posts, not pages?

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You can use post type conditional tag:

if ( 'post' == get_post_type() )

Complete:

function excerpt_count_js(){
    if ( 'post' == get_post_type() ) {
          echo '<script>jQuery(document).ready(function(){
    jQuery("#postexcerpt .handlediv").after("<div style=\"position:absolute;top:0px;right:5px;color:#666;\"><small>Character limit = 150. Current characters: </small><input type=\"text\" value=\"0\" maxlength=\"3\" size=\"3\" id=\"excerpt_counter\" readonly=\"\" style=\"background:#fff;\">&nbsp;</div>");
         jQuery("#excerpt_counter").val(jQuery("#excerpt").val().length);
         jQuery("#excerpt").keyup( function() {
         jQuery("#excerpt_counter").val(jQuery("#excerpt").val().length);
       });
    });</script>';
      }
      return;
}
add_action( 'admin_head-post.php', 'excerpt_count_js');
add_action( 'admin_head-post-new.php', 'excerpt_count_js');

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