i have the dave mustaine active pickup set.

How would the sound differ if i added another battery, so 18 volt

i play Metal, thrash, nu-metal, Drop Tunings
I'm not too sure but from the sadface i'm guessing you don't like them? I have them and i find that they sound phenomenal. What's your gear?
Schecter C-1 XXX (with SD Dave Mustaine Livewire Actives)
Roland Cube 60