Hey guys. I'm about to start a new file on my Crystal for old times, but I've read about the batteries dying which makes them unable to save. Now, my Crystal's battery isn't dead, nor my Gold, Yellow, Red, or Blue. My Silver's battery did die, but I bought it used.

What determines the battery to die out? Is it the amount of time you have played on it?

And also, has anyone ever tried replacing a battery in an old color game before? I've seen videos, but I'm afraid if I try it I'll somehow fuck it up. I read that the reason Crystal/Gold/Silver games batteries die faster is because they have the night and day transition.