Here. Go through these. Keep your eyes shut, and imagine the fight scenes that would play out during those songs.
Consider these for fights that tend to increase in speed and intensity over time. For example, between two characters with a history, or some reason to hate eachother. For the calmer, earlier part, consider 'flashbacks', to happier times between the two, leading up to betrayal or something along those lines, before the song ramps up and the two charge at one another.
Battle Beast - Into the Heart of Danger
Battle Beast - Machine Revolution
Turmion Kätilöt - Grand Ball
Blind Guardian - Battlefield
Nightwish - Planet Hell
Rob Zombie - Superbeast
Consider these for a battle that is in full swing, with one of the combatants unleashing a rapid flurry of attacks, that the other may either be blocking or dodging -or, depending on the opponent, straight up tanking.
Battle Beast - Raven
Turmion Kätilöt - Rautaketju
Children of Bodom - Kissing the Shadows
Two Steps From Hell - United We Stand
Consider these for a battle, wherein a lone hero faces off against the army that slaughtered the rest of his forces. These tend to be rather action-heavy, as the Hero is fighting multiple enemies at all times.
E.S Posthumus - Kalki
two steps from hell - Decimator
Two Steps From Hell - King's Legion