Quote Originally Posted by Poryhedron View Post
Actually, I've heard that GBA games use a slightly different technology that makes them immune to this problem.
They arent immune, kind of. Your save game isn't on the battery, but if the battery time based events wont occur and that can greatly affect gameplay, the battery can be replaced, however, in the same manner that Kirby has laid out.

Pardon the late and somewhat unrelated reply.