The battery is how the game saves. With cartridge games and many other electronic devices, there is a small battery to keep memory stored by. It keeps the games always running at a VERY low wattage, just enough to store data. If this battery dies, though, Data is no longer able to be stored. I luckily have never had this happen to me, and I hope it never does.

__________________
I am no longer leader of the Humulation Army, as I am gone. For admittance into the Army, please check PM Hombre de Mundo, the new leader.
-humulos.com---"I'm a Thwomp. I thwomp people."---ZU: The Nicest Place on Earth -
I have gone on my Mission! I won't be able to chat here for 2 years, so don't PM me! It will just be wasted bandwith... Look forward to seeing you all when I get back!