Multiple realities
(covers information from several alternate timelines)

On Klingon vessels, battle alert was an alert signal sometimes issued if it was expected that battle would be entered with another vessel. In 2365, this alert was issued on the IKS Pagh prior to an expected confrontation with the USS Enterprise-D, though the conflict was ultimately averted. (TNG: "A Matter Of Honor")

In an alternate timeline, battle alert was an alert signal used aboard the USS Enterprise-D in 2366 during the conflict with the Klingon Empire. The alert status was further categorized as condition yellow and condition red (equivalent to yellow alert and red alert in the normal timeline). (TNG: "Yesterday's Enterprise")

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