What is inside a 6 volt battery ?

http://www.metacafe.com/watch/824477/6_volt_battery_hack_youll_be_amazed/
http://www.wisebread.com/revenge-of-the-battery-hack-32-aas-inside-a-6v-lantern-battery-but-is-it-phoney
http://www.youtube.com/watch?v=1D87wnoK-xY
http://www.hoax-slayer.com/6-volt-battery-hack.shtml