What happens when the battery no longer keeps a good amount of juice?

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What happens when the battery no longer keeps a good amount of juice?
Since the battery is not user replaceable, will Samsung replace the battery for a charge?
To those who bought their Tab 7.0 in the Philippines, have you asked Samsung about this and what was their reply?

I'm curious too.
I know that whenever the battery does not hold a good amount of juice
this tablet will seem like a dinosaur anyway and I will want to replace it
but still, I might want to give it to an older relative or something so I
would like to know if Samsung could replace the battery.