The two reasons they call Adrian Loveless "Battery".
"Cold" and "Darkness" are a pair of Cavalier Deputy heavy semi-auto revolvers customized by Adrian himself, to suit his quick-drawing style better and fitted with light recoil compensation.
"Cold" is the chromed one with walnut grips, and has a stiff, short trigger. Adrian uses it primarily for rapid firing and scaring lesser Opponents away.
"Darkness" is the black one with rosewood grips. It is fitted with a highly sensitive match trigger and a mounting rail, intended for use with small scopes or special sights for precision shooting.