If money's not an issue, I would suggest (if possible) buying the battery operated scoreboard and extra batteries. When the first one of the day gets sluggish, switch over to the backup.
If that is not possible (based on design or cost), then go with the AC model - there's no point in having a scoreboard that you can only use for half of the day.
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"To win the game is great. To play the game is greater. But to love the game is the greatest of all."
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