As mentioned, the trick of being a fire mage is to do as much damage as possible before someone notices you and promptly kills you.
As such in battlegrounds, try to stick in a group, you have very little reason to get caught in a 1-1 deathmatch. Even if you do get caught in a fight, often the best tactic is to polymorph and play for time until you see either allies coming (quick win) or more of the enemy (get out of there). There's no code of conduct in the battlegrounds, you'll live longer this way and actually being doing your team a favour.
In the same vain, your initial primary nuke should be Fireblast and Scorch. The latter is important as it does not draw attention to yourself. As such you'll do more damage this way. After you start to top the damage boards, the enemy will want to hunt you down and kill you regardless. When the surprise element is lost, go for the big hitters. Otherwise, position tactically (high ground, in a bush, behind a tree) and spam away.
Try to time instants for when the enemy is less than 20% for a killing blow. This isn't so you get this on your record sheet, but rather it's because most enemies only bother to heal when at this level and this is when you need to kill them faster.
Finally, you can't talk about fire without talking about knockback. THIS is why you will spec fire for the battlegrounds.
Your main killing zones will be 1) on the top level of the flag rooms in WSG 2) at the AB mill flag 3) towers and bunkers in AV. All of which have tactical advantage and give the beautiful opportunity to send your enemy flying.
Knockback is a bit of an art. Most classes are ready for it now, so you do have to 'lure' them. Usually I position near the ledge, run through them when they approach and blast wave. Obviously hotkey slow fall for when it doesn't pan out...
Enjoy sending your opponents on a ballistic trajectory and don't forget to fireblast and scorch 'em while they shoot through the air.

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