i have used batteries in the past and can tell you this: they don't always activate but the lvl 10 ones do like 10-15 extra dmg and the kilos do 20-25 extra dmg. so these do help and as long as you have a friend or LS mate with high alc you can have them make em for you cause they aren't a popular AH item.
so ya for the dagger and sword ones that make a big dif just about doubles the dmg you just hit if it activates. as far as polearm i haven't seen it used.
right now in jueno of ragnarok battery is 20k didn't look at others.