Move WhatsApp media data to SD card
You need a rooted phone for this.


Download FolderMount.
Create a new folder in the external memory where you want the media to be stored.
Open FolderMount and add a new entry. Give it any name you like. Whatsapp media here.
In the source, specify the path of default whatsapp folder of your internal memory.
In the destination, specify the the new folder you created in your external memory card.
Done. Also, select 'exclude from mediascan' if you don't want duplicate items to be seen in the gallery or music player.