Here's a little helpful advice and info for anyone who is experiencing "The internal battery has run dry":
For what i know of, this really only affects the "timed" events in the game. For example: The "High-tide"/"Low-tide" near Mossdeep in Emerald/Ruby/Sapphire. When you set your clock in the beginning of the game, that time will never change. So it could be permanently high-tide or low-tide. Also, Mirage Tower will never show up seeing as how, technically, the day, and time of day, will never change.
To Fix This:
>You could either attempt at replacing the internal battery yourself by purchasing the battery required and a soldering gun. (You will run the risk of permanently damaging your game to where it becomes useless)
OR
>Go to your local game store that still buys and re-sells GBA games And spend a fraction of the cost to have someone who's trained to know how to do it and have them do it for you.
I had taken mine to my local game store (Gaming Generations....not GameStop) and it only costed me $10 to have it done.
Something to think about....
Hope this was helpful and/or relevant