How to display a value using id multiple times in a html document

How to display a value using id multiple times in a html document

If I am using an id to display a value in a HTML document, and if i use the same id to display the same value in another part of the screen, its not working...  see below

<label id="batchwt">NA</label>   -----------------   I am using this to show the batch weight

and now if i use this same ID = ("#bathwt") to display the same value in another part of the same HTML document, say in a table.. it doesn't work... 

<td class="d5" id="batchwt"> LB</td> --------------  I used this same id to display the value in a table, and it did not work... 

Is there any method i should use to make it work... 
Thank you....