My battle pet has some potions equipped which are never used. I can't find how to unequip them. I've tried looking through the dropdown list on the pet profile page but there's only an option for scrolls. Can't find anything in the Battle Coliseum menu either.

In the top-bar navigation drop-down menu (at the top of most pages), go to Personal > Pets then find the pet you want to unequip the potions from... Click the "Pet" link under their name and it will take to a page listing multiple options for that pet. Third down on the list will be "Edit Battle Weapons"... Click that and you should be good to go. :)

Neither the drop-down list on "Your Pets" page nor the specific pet's page has a comprehensive list of options... so it's helpful to know about both... but it is annoying to always have keep track of what's where... and how to get there. -sighs-

Thanks.