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Like other [[X-ray]] related tactics, considering batteries may be subject of [[King Safety|king safety]] terms and [[Static Exchange Evaluation|static exchange evaluation]]. A standard pattern in [[Mate at a Glance|mate at a glance]] is a battery of [[Bishop|bishop]] / [[Queen|queen]] or [[Rook|rooks]] / queen, where the queen attacks a square or opponent piece adjacent to the opponent [[King|king]], exclusively defended.
Whether a (rook-) battery deserves a general bonus in [[Evaluation|evaluation]] is debatable, assuming there are already singular bonuses for occupying [[Rook on Open File|open- or half-open files]] or the [[Rook on seventhSeventh|seventh rank]] respectively. [[Larry Kaufman]] even proposed a rook-pair penalty with respect to a [[Bishop Pair|bishop pair]] <ref>[[Larry Kaufman]] ('''1999'''). ''[http://www.danheisman.com/evaluation-of-material-imbalances.html The Evaluation of Material Imbalances]''. (first published in [https://en.wikipedia.org/wiki/Chess_Life Chess Life] March 1999, online version edited by [[Dan Heisman]])</ref>:
In my opinion, another reason is that any other pair of pieces suffers from redundancy. Two knights, two rooks, bishop and knight, or major plus minor piece are all capable of guarding the same squares, and therefore there is apt to be some duplication of function.
