This is a simple addon which prints an announcement in chat when the battle for Tol Barad is approaching, so you don't forget to queue up if you intend to. It also prints whether you are attacking or defending if that information is available.
The addon also includes functionality to keep track of the timer even when you are inside an instance or battleground, where you normally can't see the timer. As usual it prints the 15 minute and 1 minute warning and the /tbtime command will let you know the start time more exactly.

By default the addon announces when there is 15 minutes to the battle and again when it is one minute to the battle in guild chat. You can configure it to print only to yourself rather than in guild chat.
It also prints a message with the time until the next battle (only visible to you) when you log in, this can be disabled in the configuration.

Configuration:
In-game command: /tbr, /tbtime, /tbtimer, /tbreminder (all work in the same way)

/tbr - Displays the time until the next battle. (Might not be available under some circumstances inside instances or BGs)

/tbr disable - Disables all output from the addon.

/tbr enable - Enables output from the addon.

/tbr guildenable - Enables output to guild chat. (enabled by default)

/tbr guilddisable - Disables output to guild chat, and prints to only yourself.

/tbr loginenable - Enables the timer message as you log in. (enabled by default)

/tbr logindisable - Disables the timer message as you log in.